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The sequel to Boundary and Threshold . New York Times Best-Selling Author and a Rising Star of SF and Fantasy Continue their Popular Space Adventure Series.

The sequel to Threshold , Book Three in the Boundary series.

HELL FROZEN OVER

Madeline Fathom had miraculously landed the crippled Nebula Storm on Europa. She joined on that frozen moon of Jupiter the stranded crewmembers of the ill-fated EU vessel Odin . The Nebula Storm 's reactor was ruined in the landing, the Odin ’s shuttle can’t make the trip back home, and the only vessel that could have make the journey to save them has just been destroyed by a renegade crewman, bad luck, and the remorseless forces of nature.

But Madeline, Helen Sutter, A.J. Baker and the team have one card left to play. All they have to do... is survive lethal radiation, vacuum, and ice as hard as steel while they figure out how to make Nebula Storm fly again.

But even as they prepare to make the journey home, Europa has one more discovery waiting for them... a discovery that might be the deadliest trap in the Solar System!

Praise for previous books in this
“. . . fast-paced sci-fi espionage thriller . . . light in tone and hard on science . . .” — Publishers Weekly on Boundary

“The whole crew from Flint and Spoor's Boundary are back. . . . Tensions run high throughout the Ceres mission . . . a fine choice for any collection.” — Publishers Weekly on Threshold

“[P]aleontology, engineering, and space flight, puzzles in linguistics, biology, physics, and evolution further the story, as well as wacky humor, academic rivalries, and even some sweet romances.” — School Library Journal on Boundary

416 pages, Mass Market Paperback

First published May 7, 2013

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239 people want to read

About the author

Eric Flint

250 books873 followers
Eric Flint was a New York Times bestselling American author, editor, and e-publisher. The majority of his main works were alternate history science fiction, but he also wrote humorous fantasy adventures.

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5 stars
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Displaying 1 - 30 of 42 reviews
Profile Image for Andreas.
Author 1 book31 followers
May 13, 2013
After the debacle at the end of Threshold, our heroes plus the few survivors of the EU ship Odin are marooned on Europa, a moon of Jupiter thought to have a liquid ocean underneath a globe-spanning icecap. The first half of the book focuses mainly on survival, while the second deals with the exploration of the Europan icecap and the obligatory thrilling cliffhanger.

This book is almost a throwback to old school “explore the solar system” science fiction. The struggle for survival itself becomes the subject of examination and discussion, but without becoming boring. The Universe is light and cheery and full of wonder despite its many dangers. The fleshed out characters make things come alive. The dialogue may sometimes be cheesy, but it always feels authentic. Real people don’t always spout cool one-liners, and some real people love horrid puns. The physics are real and well researched; I have learned more about ice behavior in low pressure and temperature than I thought I needed to know, but it was interesting. As with the previous installment, the story was on the light side, especially the conspiracy subplot. Also as with the previous installment, I liked this book more than it probably deserved simply because it is a joy to be with the characters on their fantastic adventures.

http://www.books.rosboch.net/?p=1634
Profile Image for Craig.
6,396 reviews179 followers
April 24, 2014
This is a very nice conclusion to the trilogy begun in BOUNDARY and continued in THRESHOLD. I absolutely loved the first book, but thought the middle volume got too bogged-down with political issues. I was happy to find this one returned the focus to the scientific discoveries and philosophies that made the original so good. It picks up right where the second one concluded, with out heroes stranded on Europa, and (after a somewhat overwhelming info-dump first chapter to bring anyone unfamiliar with the origin up to speed), comes to a very satisfying conclusion with lots of adventures and discoveries along the way. This is excellent -science- fiction.
Profile Image for Clyde.
965 reviews52 followers
March 22, 2013
Portal completes Eric Flint's and Ryk E. Spoor's Boundary trilogy. This book starts precisely where Threshold ends, making it a continuation of that story. The crew of the crippled Nebula Storm and the survivors of the Odin find themselves shipwrecked on Europa. They have a lot of adventures, many of the do-or-die sort, as they struggle to survive in a hostile environment and to get back home. The mix of engineering, space flight, paleontology, biology, physics, and a surprising first-contact situation makes for a fun read.
Interesting SF; good book.
575 reviews7 followers
June 23, 2016
Too many one-in-ten-million chances that somehow pan out

I really liked the first two books in this series. Although they both had an excess of serendipity, they also had sympathetic characters, plenty of action, some interesting scientific questions, fun discoveries and lots of 'What If?' to balance it all out.

That sense of balance is what this book lacks. Too much of the story is a series of disasters and discoveries that repeatedly hurtle onto the page with no breathing room left between, leaving no chance of character or relationship developments. There's one disaster after another, but somehow each would-be tragedy is paired with a spectacularly improbable save. Not everyone makes it, of course, but at one point or another, almost everyone lives in some unrealistic way when they really should have died. To top it all off, during the final incredibly prolonged rescue attempt, yet another impossible discovery happens, even though the odds against it are worse than the odds of one person winning ten Powerball lotteries in a row.

I did, finally, get to the last page--but it wasn't easy or pleasant. All those death-defying escapades and shocking discoveries made the book both tedious and exhausting. I just wanted the story to end--and I can't think of another book I've felt that way about. There are plenty of well-written books I find dull: the subject doesn't interest me, or I don't care enough about the characters, or I feel the author's world is too claustrophobic, ugly or painful for me to stay immersed in, so I don't finish them.

With this one, however, I had a different problem. I wasn't ever bored, as there's far too much going on, the situation itself was fascinating, and I still cared about the characters and wanted them to find a way to survive and win against their enemies. I just desperately wanted everyone to get off the rollercoaster safely and be someplace where they could relax long enough to regain their sanity. At that point it felt like we all needed room to remember that most of life is made up of very ordinary things and that most of us are very ordinary people, who are living mostly very ordinary lives. The extraordinary does break through our lives sometimes, and some of us become extraordinary for long moments of time, but that's not something we can sustain for long. After a certain duration, even extraordinary events become banal, because that's the only way we can survive them.

In that way, Portal strongly reminded me of Jean Auel's Clan of Cave Bear, a book in which a woman who begins as a sexual tool and slave to the men of her group, manages to raise herself up socially, invent language, discover fire, develop new methods of hunting and farming, and completely reshape her entire society. Clan of Cave Bear's heroine didn't seem like a real person because she was just too good at absolutely everything, as well as so unbelievably lucky that Auel should have just made her the personification of Good Fortune. She was more a goddess than a human being, and as the book went on, she just kept adding to her list of accomplishments. After a certain point, I just kept wanting to laugh. I was waiting for her to split the atom while stumbling into a portal into another dimension where she'd find the Fountain of Eternal Youth and incidentally decode the human genome...

Portal isn't that ridiculous, since at least the characters are mostly lucky in their own fields, but the sheer number of wild escapes and earth-shaking discoveries became so overwhelming that it actually got tedious. No sooner had they Macgyvered themselves out of one bottomless pit than they were falling into the next even deeper one, or else tripping over yet another revolutionary bit of science, all while making miraculous discoveries that propel them light years ahead of everyone else in their fields. No one has such a long run of luck this bad or this good, and even Jeremiah Joe Buckley was pushing his fortunes much too far by the end.

After a certain number of authorial missteps, the reader can begin to regret her once-willing suspension of disbelief, and to lose faith in the author's willingness or ability to keep the story aloft, steer it well, and guide it at last into a satisfying harbor. This book certainly had me doubting Eric Flint and Ryk Spoor, and yet because I've read and liked so many of their other books, their works stay on my reading list and I'll continue with the fourth book of the series.
1,447 reviews9 followers
December 30, 2013
Eric Flint and Ryk R. Spoor have a nice trilogy about ancient beings with a base on Mars and other parts of the Solar System. In Boundry (paper) our hero’s discover and explor the base, finding new technology and the possibility of a base on Ceres. In Threshold (paper) the value of a base on one of Jupitor’s moons leads to a race. Alas someone one put weapons on one of the ships and in a race to the new base attacks the other ship. So we open up in Portal (hard from Baen with one ship and the few survivors from the other in a lander on Europa, the moon of Jupitor with a water filled center. Only by working together can they survive and put the pieces of their ships the the remains of a third in orbit together. Of course they’re scientists so, when survival is assured, they decide to look at a bubble in the ice, which leads them to make a small expedition with a rover. Alas a Europa quake traps the rover and at the same time allows a view into Europa’s inner ocean. The authors’s really know their science, and create a well -grounded and fun tale about exploration of the solar system. Fun. Review published in the Philadelphia Weekly Press
Profile Image for Beth.
844 reviews75 followers
April 15, 2016
Such a good series!
Action, adventure, political wrangling, thought provoking science, well developed characters and plot induced trauma, humor and a touch of romance.
Profile Image for NAY Young.
24 reviews
February 26, 2013
I would have preferred it if it had been part of Threshold - it reads very much as a continuation of that book rather than a story on its own. Still - great conclusion to the series.
Profile Image for Allen McDonnell.
553 reviews1 follower
March 10, 2021
A rounded out conclusion to the first three novels

Nearly all of this novel takes place on Europa where the desperate survivors from the Odin and Nebula Storm must work together to build a functional ship out of the wrecked remains of their two vessels. Along the way they discover the distant descendants of ancient aliens who had bioformed life as they knew it to survive in the deep dark seas of Europa's endless ocean.
11 reviews3 followers
July 30, 2020
A great book, and a worthy successor to the first two Boundary books, but the sheer improbability of the series of events is starting to grate on me a little bit - therefore 4 stars against the 5 I gave its predecessors. Even with that small strike against it, this is solid hard sci-fi with loveable characters and an exiting plot. Well worth the read for fans of the genre.
6 reviews
February 28, 2023
Disaster in Space

Two spaceships, one new, one extremely old, are nearly destroyed and crash on a moon around Jupiter. No rescue can get to them quickly so they must devise a way to rescue themselves, but the ice-covered moon thwarts them nearly every time. A fantastic discovery is made there.
Profile Image for Donald Franck.
Author 17 books3 followers
July 14, 2020
The future not yet written.

This series was both a surprise and a pleasure. As you travel across a rocky landscape, you step back in time 65 million years. And end, in a time and place not yet dreamed of. I enjoyed both directions.
Profile Image for Ralph McEwen.
883 reviews23 followers
November 26, 2022
I missed book 2. If you read this out of order just accept that something bad happened in the previous books as that stuff is referenced enough. In this book, enjoy a good thrilling adventure without sulking enemies or other evil doers.
Profile Image for Frank.
182 reviews1 follower
April 15, 2019
Better than Threshold!

Satisfying conclusion to main series
Profile Image for Ray A.
130 reviews
April 27, 2020
Very good end to a fun trilogy

It took me a few years to finally get around to finish the trilogy with this book, but the third book closed off everything quite nicely
72 reviews1 follower
April 21, 2021
Absolutely riveting!!

This is a great series for sci-fi, suspense, or action lovers!

I absolutely recommend it for all readers with these interests!

Profile Image for Catching Shadows.
284 reviews28 followers
August 6, 2020
In Portal, our heroes are stranded on Europa after the events of Threshold. While they and the survivors from the Odin attempt to jury-rig a way to get home, they discover that General Hohenheim is still alive and work out a way to rescue him. (They are also making an effort to keep what happened more or less secret. There is a very real concern about further attempts at sabotage or murder from the enemies who instigated the events of the previous book.) Meanwhile, back on Earth, there is a growing suspicion that the accident wasn’t one.

Despite the very desperate situation Our Heroes find themselves in, they are not the types to avoid doing Science when there is Science to do. In between the ongoing “find a way to get home” project they do some exploring that leads to a number of shocking discoveries and also some terrifying accidents that lead to still more discoveries. (It is of course no surprise that Joe Buckley is involved in the terrifying accidents. The universe still seems determined to either scare or beat the crap out of him. Of course, this might be an improvement over universes where the universe is actively attempting to kill him.)

This is an extremely fast-paced, engaging novel with some fun character interactions and a strong sense of adventure. The only thing I didn’t like about the book is that it felt much too short. I think I would have liked more details about some of the discoveries, or at least some more development of the various character arcs. This is another transitional book in the series that leaves you waiting for more.
This entire review has been hidden because of spoilers.
Profile Image for Jo .
2,679 reviews68 followers
July 21, 2013
If you have read the Boundary series from book one you don’t want to miss reading Portal. If you have not read the series from book one start do not start with Portal. Why:

Backstory: All of it is in the previous books. This picks up directly after the end of book 2 and while there are hints about what happened before they would be more confusing than enlighting if you had not read the previous books.

Worldbuilding: Same as backstory. Most of the worldbuilding was done in the previous books. You know it is the future but without the backstory the world might not be that plain.


Characters: There is some character development. Most of the characters have been part of the story in the previous books and they their development was done then. Many have some unique traits that might seem strange if you are meeting them for the first time.

Plot: Book two left them in a big fix. Getting home is the focus of the book with some additional plot features added.

I sound like a broken record but Portal for everyone who has read the previous two. It is well written, has a good story and is an enjoyable conclusion to the Boundary series. It is not a good standalone book.
Profile Image for Ashley.
Author 10 books10 followers
November 23, 2023
Portal by Eric Flint and Eric E. Spoor is the third book in the Boundary series.

Boundary is the first book in the series. The story starts with an archaeological dig finding the fossilized remains of aliens. Apparently they were killed by a bunch of Raptors when they landed on Earth 65 million years ago, which places their death on what is called the KT boundary. This discovery leads to sending a mission to Mars, where the discovery of a base on Phobos then leads to further discoveries of a base on Mars. Needless to say the race is on to exploit the alien technology. Threshold, the sequel to Boundary, takes the story to Ceres, and then on to Jupiter, ending with the expedition stranded on Europa.

So I was keen to read Portal, and find out where the story would go next.

The series is unashamedly traditional old school science fiction. While it may not have won any awards, the story of finding the alien Bemmies (bug eyed monsters), makes for a fun read. The story has dinosaurs, squid like aliens, and spaceships. What more can one ask for? I certainly wanted to continue turning the pages to find out what happened next?
Profile Image for Julia.
1,187 reviews37 followers
May 5, 2014
This is a sequel to Boundary and Threshold. While reading the first part of Portal I could easily hear a voiceover from a 1930s-type radio show saying "When we last saw our intrepid heroes..." Since it had been a while since I had read the previous books, I appreciated the recap.

I really enjoyed this book, but felt there was a little too much scientific detail/infodumps.

Profile Image for Daniel Bratell.
885 reviews12 followers
July 23, 2016
This is the third book in the series about 65 million old aliens (or rather alien remains) found in the solar system.

In the previous book we left our heroes stranded on Europa after a sociopath of a security officer on the EU vessel decided to blow everyone up, with some success.

This is not a good book. If you absolutely loved the previous book, you may like this one as well, but not because the book is good but because you are a good fit to the story. If you are not a good fit, then you are left with a book that is not very good.

The story is predicable (if you've read enough similar books) and the characters implausible. Yes, they are still super humans looking like super models, with super skills. Something like in the Starship Troopers movie, I would guess.
Profile Image for Grant.
1,418 reviews6 followers
June 25, 2013
Flint and Spoor conclude their hard science fiction trilogy on Europa and in Jupiter orbit. The main characters' antagonist is now the harsh environment of that icy moon, and the challenges of linking their crippled vessels into a ship that can get them home. The science is good, and presented in a way a layperson can understand and enjoy, and the characters, while not quite fully fleshed out, are people for whom the reader can root.
196 reviews
April 3, 2015
Third in the series. Stranded on Europa the two crews must work together to repair the ships and return to earth. This is a series about discovering what is out there (in space) and you know there is going to be more to it than that. This is a great series about what the future of space exploration might look like. The science is not too science fictional and is based in solid physics.
Profile Image for Beth Revers.
224 reviews1 follower
June 5, 2013
Wonderful close to the trilogy. Lots of action and suspense. By now you have come to truly care about these people. Well worth reading the trilogy. Thought provoking and satisfying. My husband even fussed about me "reading too much" Silly boy.
Profile Image for Jeffrey.
113 reviews5 followers
August 30, 2013
Turned out I had already read it. I re-read anyway.

Lots of spaceshippy stuff well done. A couple of scientific nonsensical parts which could have been worked around.

But when they make make the Big Discovery about 3/4 the way through it takes off, story wise.
Profile Image for Kenneth Flusche.
1,066 reviews9 followers
September 22, 2013
This book third and final in the series could stand alone, better written than the first two. There are spoilers so I recommend read them in order if this type of SF is yours. But if you are an occational reader read away.
Profile Image for Sherrill Watson.
785 reviews2 followers
October 27, 2015
Too fluffy for me. Didn't get much of a feel for different personalities, despite the repartee. Well, maybe the General, who was a cardboard character. Nearly at the end of the book, the plot line took off, and it was more interesting. Sorry, author(s), this one left me pretty flat.
Displaying 1 - 30 of 42 reviews

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