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Archimedes Engine #2
The Helium Sea
Not yet published
Expected 16 Jun 26The epic conclusion of the Archimedes Engine duology by legendary author Peter F. Hamilton. Set in the universe of EXODUS, a new sci-fi action-adventure RPG coming soon from Archetype Entertainment.
For millennia, the Crown Dominion has been at relative peace, with the Celestials in control and the human population little better than serfs. But now the Crown Dominion is facing a crisis of epic proportions—one that could change the balance of power in the Centauri Cluster forever—as an exiled faction that has been waiting for seven thousand years beyond the Helium Sea has returned to claim their vengeance.
For Finn and his human allies, who have ended up at the center of this conflict either through circumstance or manipulation, this is an unprecedented opportunity. If they can band together, they may be able to outwit the Celestials and finally earn their fellow humans a place of independence and power in the Crown Dominion. But first they must locate and master ancient artifacts of immense power that could give them a needed edge in the conflict ahead. And all while ducking the forces that are determined to knock them off the board for good.
For millennia, the Crown Dominion has been at relative peace, with the Celestials in control and the human population little better than serfs. But now the Crown Dominion is facing a crisis of epic proportions—one that could change the balance of power in the Centauri Cluster forever—as an exiled faction that has been waiting for seven thousand years beyond the Helium Sea has returned to claim their vengeance.
For Finn and his human allies, who have ended up at the center of this conflict either through circumstance or manipulation, this is an unprecedented opportunity. If they can band together, they may be able to outwit the Celestials and finally earn their fellow humans a place of independence and power in the Crown Dominion. But first they must locate and master ancient artifacts of immense power that could give them a needed edge in the conflict ahead. And all while ducking the forces that are determined to knock them off the board for good.
Hardcover
Expected publication June 16, 2026
About the author
Peter F. Hamilton
196 books10.4k followersPeter F. Hamilton is a British science fiction author. He is best known for writing space opera. As of the publication of his tenth novel in 2004, his works had sold over two million copies worldwide, making him Britain's biggest-selling science fiction author.
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Displaying 1 - 5 of 5 reviews
April 5, 2026
4.75/5
I received a copy of this book on Netgalley in exchange for an honest review.
Massive and expansive but surprisingly focused space opera. This takes the build up of Archimedes Engine and runs with it beautifully. It is a masterfully plotted adventure that takes the many threads built up over the series and weaves them together in an intricate and satisfying way while leaving plenty on the table to explore in the future.
From the get-go we're picking up where Archimedes Engine left off and we get immediate payoff from what it set up in awe inspiring and, often terrifying, moments.
I don't think I can emphasize enough how good the politics are. The many different factions, their motivations, their hidden schemes, and the dynamic nature of the alliances that form and break over the story is seriously impressive, it has to be some of my favorite politics in fiction.
It makes it fairly complex to keep track of, but it is very rewarding and engaging and made the world feel real and deep. It also makes the plot extremely compelling, as I was constantly thinking about what was going to happen and how these various factions might interact and conflict with each other. Often the characters involved are very long-lived so these Great Games they've been playing have been set up for millennia.
The world building is impressive and well thought out. It's clear Hamilton put a lot of legwork into the world and he is disciplined enough to maintain focus on telling the story he set out to tell in a way that reasonably wraps up in the 1600 or so page budget for the duology.
While this is by no means a short story, if anything, I think this could have been a 5+ book series and in a lot of ways it could have benefitted from a bigger page count, but I do appreciate that we weren't left waiting for years and years for the resolution to the story. So while I do want more, I am satisfied with what I've read so far and will be thinking of this world for quite some time to come.
Some of the plot points resolve a bit too quickly, it needed some breathing room after big climactic moments. In some ways some of the big confrontations resolve a bit too easily but it keeps the story moving and we don't get hung up on any particular plotline. This makes some of the moments with the characters not hit as hard as I think they could have, it's sort of a tradeoff for a faster moving plot and the consequence is we don't connect with the characters as much and don't have as much of an emotional connection with them.
I do think Hamilton could have added some more pages to make these moments a bit harder hitting when they happen but I was able to connect some of the dots in my head to put myself in the shoes of the characters, but it's definitely not the focus for the story. This is consistent with other Hamilton series so I'm not surprised but it could have been an area of improvement.
One of the technologies is used as a bit of a crutch multiple times (3 times that I remember) and in very similar ways to give insight into the antagonist factions without having as much at stake. This particular technology is a pretty interesting idea, I'm just not sure the implications of it were explored fully and it was a pretty convenient plot device at times, it wasn't a deal breaker for me however.
I do think the plot felt like you could tell it was set up to play out a particular way at times and could have been a little more dynamic and messy, but there were also plenty of surprises along the way, so not that big of a negative against the series.
Overall this is one of my favorite space operas and one of my favorite reads of this year. Really looking forward to the video game and hope it lives up to the story and world in the books.
I received a copy of this book on Netgalley in exchange for an honest review.
Massive and expansive but surprisingly focused space opera. This takes the build up of Archimedes Engine and runs with it beautifully. It is a masterfully plotted adventure that takes the many threads built up over the series and weaves them together in an intricate and satisfying way while leaving plenty on the table to explore in the future.
From the get-go we're picking up where Archimedes Engine left off and we get immediate payoff from what it set up in awe inspiring and, often terrifying, moments.
I don't think I can emphasize enough how good the politics are. The many different factions, their motivations, their hidden schemes, and the dynamic nature of the alliances that form and break over the story is seriously impressive, it has to be some of my favorite politics in fiction.
It makes it fairly complex to keep track of, but it is very rewarding and engaging and made the world feel real and deep. It also makes the plot extremely compelling, as I was constantly thinking about what was going to happen and how these various factions might interact and conflict with each other. Often the characters involved are very long-lived so these Great Games they've been playing have been set up for millennia.
The world building is impressive and well thought out. It's clear Hamilton put a lot of legwork into the world and he is disciplined enough to maintain focus on telling the story he set out to tell in a way that reasonably wraps up in the 1600 or so page budget for the duology.
While this is by no means a short story, if anything, I think this could have been a 5+ book series and in a lot of ways it could have benefitted from a bigger page count, but I do appreciate that we weren't left waiting for years and years for the resolution to the story. So while I do want more, I am satisfied with what I've read so far and will be thinking of this world for quite some time to come.
Some of the plot points resolve a bit too quickly, it needed some breathing room after big climactic moments. In some ways some of the big confrontations resolve a bit too easily but it keeps the story moving and we don't get hung up on any particular plotline. This makes some of the moments with the characters not hit as hard as I think they could have, it's sort of a tradeoff for a faster moving plot and the consequence is we don't connect with the characters as much and don't have as much of an emotional connection with them.
I do think Hamilton could have added some more pages to make these moments a bit harder hitting when they happen but I was able to connect some of the dots in my head to put myself in the shoes of the characters, but it's definitely not the focus for the story. This is consistent with other Hamilton series so I'm not surprised but it could have been an area of improvement.
One of the technologies is used as a bit of a crutch multiple times (3 times that I remember) and in very similar ways to give insight into the antagonist factions without having as much at stake. This particular technology is a pretty interesting idea, I'm just not sure the implications of it were explored fully and it was a pretty convenient plot device at times, it wasn't a deal breaker for me however.
I do think the plot felt like you could tell it was set up to play out a particular way at times and could have been a little more dynamic and messy, but there were also plenty of surprises along the way, so not that big of a negative against the series.
Overall this is one of my favorite space operas and one of my favorite reads of this year. Really looking forward to the video game and hope it lives up to the story and world in the books.
Review of advance copy received from NetGalley
Thank you to the author, publisher, and NetGalley for the eARC!
A true space opera at its best. The stakes are high, everyone is playing the Great Game, and the time dilitation ads a dimension of extra risk.
I read the first book in this duology just a few months ago, and it made it significantly easier for me to get into the second book smoothly. The amount of characters, dominions, technology, and historical concepts can be overwhelming if you’ve been out of the universe for a while. Ideally, I would recommend reading both books back to back to ensure 100% pleasure and detailed knowledge.
I’m in love with how deeply layered, complex, and entangled the universe of Archimede Engine is. Players playing different levels of the multidimensional Great Game, pieces slowly coming together, with misconceptions, assumptions, and holes in the story, only to ally with enemies and betray allies. We start right in the middle of the action, right where the first tome finished. The Usurper Empress is playing the role she was destined for since she was a child and rebelling against her family. She’s brilliantly strong, conniving, independent, and paranoid. If you spent your whole life playing your part, can you even see when the world is fraying at the edges? Who do you trust if you cannot trust anyone? The Estranged Queens are desperately trying to reorient themselves in the new universe’s setup, teaming up with unlike allies to win or lose completely. Sidelined and oh so dependent on humans, brave until the end, great sacrifices, and greater egos at play. And the many, many humans coming together to devise a plan that will help them get ahead in this Great Game, especially when they don’t even know the true players. Flying at relativistic speeds to outrun the aliens, the destruction, the threat, themselves. A great political intrigue played at the planes of galaxies, with empires and thousands of years of machinations. The plot is getting thicker, with knots slowly resolving into a better understanding, if only for some parties involved. The mastermind ploy finally revealed, where all the bodies, losses, and wiped worlds are worth the price paid. Peter F. Hamilton is one of the greatest minds in Sci-Fi, and I’m, for once, eternally grateful he did not go into politics. To design such dynasties and such a complicated world of betrayal makes him a dangerous man.
My only issue is with the ratio of battles to deaths. In Exodus, we were losing dozens of characters, some of importance, affecting the Game, and accelerating the actions, whilst still playing at stealth and throwing suspicion at the others. In The Helium Sea, the conflicts are bloody, full-blown assaults and battles, a universe-spanning war, and we barely lose anyone?
A true space opera at its best. The stakes are high, everyone is playing the Great Game, and the time dilitation ads a dimension of extra risk.
I read the first book in this duology just a few months ago, and it made it significantly easier for me to get into the second book smoothly. The amount of characters, dominions, technology, and historical concepts can be overwhelming if you’ve been out of the universe for a while. Ideally, I would recommend reading both books back to back to ensure 100% pleasure and detailed knowledge.
I’m in love with how deeply layered, complex, and entangled the universe of Archimede Engine is. Players playing different levels of the multidimensional Great Game, pieces slowly coming together, with misconceptions, assumptions, and holes in the story, only to ally with enemies and betray allies. We start right in the middle of the action, right where the first tome finished. The Usurper Empress is playing the role she was destined for since she was a child and rebelling against her family. She’s brilliantly strong, conniving, independent, and paranoid. If you spent your whole life playing your part, can you even see when the world is fraying at the edges? Who do you trust if you cannot trust anyone? The Estranged Queens are desperately trying to reorient themselves in the new universe’s setup, teaming up with unlike allies to win or lose completely. Sidelined and oh so dependent on humans, brave until the end, great sacrifices, and greater egos at play. And the many, many humans coming together to devise a plan that will help them get ahead in this Great Game, especially when they don’t even know the true players. Flying at relativistic speeds to outrun the aliens, the destruction, the threat, themselves. A great political intrigue played at the planes of galaxies, with empires and thousands of years of machinations. The plot is getting thicker, with knots slowly resolving into a better understanding, if only for some parties involved. The mastermind ploy finally revealed, where all the bodies, losses, and wiped worlds are worth the price paid. Peter F. Hamilton is one of the greatest minds in Sci-Fi, and I’m, for once, eternally grateful he did not go into politics. To design such dynasties and such a complicated world of betrayal makes him a dangerous man.
My only issue is with the ratio of battles to deaths. In Exodus, we were losing dozens of characters, some of importance, affecting the Game, and accelerating the actions, whilst still playing at stealth and throwing suspicion at the others. In The Helium Sea, the conflicts are bloody, full-blown assaults and battles, a universe-spanning war, and we barely lose anyone?
Review of advance copy received from Netgalley
I received an ARC from Netgalley and the publishers in exchange for an honest review.
I was already a pretty big PFH fan before starting this duology, but Exodus: The Archimedes Engine was incredible so I was thankful I got a chance to read the sequel before its release date. And it was not a surprise at all that Exodus: The Helium Sea was an absolute banger.
It picks up right where book 1 leaves off in typical PFH style and it wastes no time. It drops you right into the action and political scheming and does not let up for the entire book. The pacing is fast as the plot progresses from one thing to the next quite rapidly. This really lets you get immersed and hooked in as you want to get to the next thing. The political scheming is a real highlight here. If that's your thing in fantasy you'll like it here as well and it is done exceptionally well. There are also some amazing scenes and things that are truly imaginative from a worldbuilding perspective. I was engrossed at the scope.
There are a few good characters here, especially Terrence, who I would consider the main character probably. He gets a lot of nice development and has a good arc over the course of the books. That being said, these books are really plot and world building driven and not character focused. That doesn't mean the characters aren't good or memorable. Their development just doesn't drive the story as much. No big coming-of-age arcs here (mostly).
As with any story I do have some nitpicks or some things I would consider flaws to call out. Sometimes the pacing feels a bit too fast and big moments either don't get room to breathe or they don't get the epic descriptions PFH is certainly capable of and can deliver. There is also a plot device that feels a bit overused. However, neither of these items ruined or even hurt the book for me. And for all I know they may be addressed in the final version.
I heavily recommend this book and series. The juice is definitely worth the squeeze, and if half of what was in the book is in the upcoming game it was surely be worth playing.
I was already a pretty big PFH fan before starting this duology, but Exodus: The Archimedes Engine was incredible so I was thankful I got a chance to read the sequel before its release date. And it was not a surprise at all that Exodus: The Helium Sea was an absolute banger.
It picks up right where book 1 leaves off in typical PFH style and it wastes no time. It drops you right into the action and political scheming and does not let up for the entire book. The pacing is fast as the plot progresses from one thing to the next quite rapidly. This really lets you get immersed and hooked in as you want to get to the next thing. The political scheming is a real highlight here. If that's your thing in fantasy you'll like it here as well and it is done exceptionally well. There are also some amazing scenes and things that are truly imaginative from a worldbuilding perspective. I was engrossed at the scope.
There are a few good characters here, especially Terrence, who I would consider the main character probably. He gets a lot of nice development and has a good arc over the course of the books. That being said, these books are really plot and world building driven and not character focused. That doesn't mean the characters aren't good or memorable. Their development just doesn't drive the story as much. No big coming-of-age arcs here (mostly).
As with any story I do have some nitpicks or some things I would consider flaws to call out. Sometimes the pacing feels a bit too fast and big moments either don't get room to breathe or they don't get the epic descriptions PFH is certainly capable of and can deliver. There is also a plot device that feels a bit overused. However, neither of these items ruined or even hurt the book for me. And for all I know they may be addressed in the final version.
I heavily recommend this book and series. The juice is definitely worth the squeeze, and if half of what was in the book is in the upcoming game it was surely be worth playing.
Review of advance copy received from NetGalley
There are different kinds of four star books. Some are solid all the way through, but lack the elements necessary to make it truly next level. Some are seriously flawed, but manage to rise above their flaws with great execution of certain elements. Then there is the Helium Sea, a great fantastic novel let down by a few things in its ending.
I do recommend this book, it follows up from book 1 in all the best ways. I just felt the ending was a little rushed, the last line before the epilogue is terrible, and that one character’s choice in the finale did not sit right with me. All of this served to bring what would have been an easy five stars down to four.
Hamilton is an interesting author. He’s not the best dialogue writer ever- even his post humans sound like they regularly scroll Twitter in the early 21st century- but he can describe space opera craziness in a way that read very clear to me. I never had any trouble understanding where the characters were in the action scenes, or have trouble picturing the wild tech they are up against.
I would say this book has just one too many times where characters arrive at the same spot at the same time when traveling through the vast distances of space, but that kind of has to happen to make the plot work. On all other fronts aside from the very end- character work, action, expanding the world, this book delivers.
I do recommend this book, it follows up from book 1 in all the best ways. I just felt the ending was a little rushed, the last line before the epilogue is terrible, and that one character’s choice in the finale did not sit right with me. All of this served to bring what would have been an easy five stars down to four.
Hamilton is an interesting author. He’s not the best dialogue writer ever- even his post humans sound like they regularly scroll Twitter in the early 21st century- but he can describe space opera craziness in a way that read very clear to me. I never had any trouble understanding where the characters were in the action scenes, or have trouble picturing the wild tech they are up against.
I would say this book has just one too many times where characters arrive at the same spot at the same time when traveling through the vast distances of space, but that kind of has to happen to make the plot work. On all other fronts aside from the very end- character work, action, expanding the world, this book delivers.
Review of advance copy received from Netgalley
This is likely Peter F Hamilton's best series to date. He nails the duology finale and is even able to present new plotlines that resolve quickly and with the same action and technical detail fans are used to seeing from one of the best in the history of SF. Everything you want is in this series and Hamilton is able to avoid genreblending that has taken some fans away from previous series. Highly recommended.
Displaying 1 - 5 of 5 reviews