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The Lost Fleet #5
Catalyst
The war has finally come home.
Fresh off his battles in Pact space, Commander Zeris must now return to defend the Dominion from the relentless Dowd onslaught. With their new anti-psionic weapons, the faceless aliens threaten everything, even the precious Golden Worlds.
But an Immortal is never out of the fight. Aided by his loyal crew - and his loyal women - Kal concocts a dangerous plan to end the war once and for all.
Catalyst is the fifth and final book in Sarah Hawke's best-selling space opera series The Lost Fleet.
Fresh off his battles in Pact space, Commander Zeris must now return to defend the Dominion from the relentless Dowd onslaught. With their new anti-psionic weapons, the faceless aliens threaten everything, even the precious Golden Worlds.
But an Immortal is never out of the fight. Aided by his loyal crew - and his loyal women - Kal concocts a dangerous plan to end the war once and for all.
Catalyst is the fifth and final book in Sarah Hawke's best-selling space opera series The Lost Fleet.
355 pages, Kindle Edition
Published October 14, 2024
About the author
Sarah Hawke
80 books278 followersSarah Hawke is a prolific writer of science fiction and fantasy in multiple genres, including erotica, harem, and bondage. Her books are known for their intricate world-building, twisting plots, and fleshed-out characters—and of course their many intense, steamy sex scenes.
If you are interested in "pure" traditional harem stories, The Lost Fleet is the perfect place to start! Wings of the Seraph is a shorter, older series but also hits most of the traditional harem notes. Shadow of the Seraph features a rotating male and female pov with some F-F scenes involving temporary futanari, so avoid that unless it is your jam!
Her fantasy universe features many types of erotica stories involving bondage (Elf Slave, all the Spider Queen books) and non-traditional harems (The Amazon's Pledge, The Amazon's Vengeance). She also has two ongoing fantasy erotica series with intense action and multiple points of view, War of the White Throne and The Blade of Highwind.
If you are interested in "pure" traditional harem stories, The Lost Fleet is the perfect place to start! Wings of the Seraph is a shorter, older series but also hits most of the traditional harem notes. Shadow of the Seraph features a rotating male and female pov with some F-F scenes involving temporary futanari, so avoid that unless it is your jam!
Her fantasy universe features many types of erotica stories involving bondage (Elf Slave, all the Spider Queen books) and non-traditional harems (The Amazon's Pledge, The Amazon's Vengeance). She also has two ongoing fantasy erotica series with intense action and multiple points of view, War of the White Throne and The Blade of Highwind.
Ratings & Reviews
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Displaying 1 - 14 of 14 reviews
February 23, 2026
CATALYST by Sarah Hawke is the last of the Lost Fleet series that I enjoyed from beginning to end. Here, our hero and his entourage of beautiful co-stars are going to deal with the sinister Dowd before they exterminate humanity's Golden Worlds. Along the way our protagonist will bone a lot of hot aliens and one genetically engineered superwoman. I like all of the characters, the ending was satisfactory, and hope we'll see a sequel someday.
April 26, 2026
I ended up enjoying this series SO much! With the first books I wasn't quite sure if this series was going to be a yes or no for me but it got better with each book. It is soooo different, funny, weird, and keeps you locked in waiting to see what happens next.
I listened to all 5 books on audio and did enjoy the audiobooks but didnt like that book 5 was a different guy doing the voice but I eventually got used to it.
Highly recommend if you live Scifi!
Really hope there will be more to come, like maybe another series in the future of where the epilog ended and seemed to be leading into something new.
I listened to all 5 books on audio and did enjoy the audiobooks but didnt like that book 5 was a different guy doing the voice but I eventually got used to it.
Highly recommend if you live Scifi!
Really hope there will be more to come, like maybe another series in the future of where the epilog ended and seemed to be leading into something new.
October 28, 2024
This has been another strong entry into this series by the author. The space opera elements and the diplomacy and solving of matters by the MC are well done. I like the MC, and the various harem members are vastly different from each other. And they manage to slowly but surely break down walls between each other despite their racial tensions.
I very much look forward to book 6, which will wrap up this series.
I very much look forward to book 6, which will wrap up this series.
October 23, 2024
Wonderful writing - very imaginative and creative
This series is excellent and this book a very worthy addition. I am certainly happy I picked it up and read it. The author does an awesome joy of keeping the reader guessing which way the winds of the plot will blow while maintaining the integrity of the characters. Just very good, solid writing by a highly polished author.
This series is excellent and this book a very worthy addition. I am certainly happy I picked it up and read it. The author does an awesome joy of keeping the reader guessing which way the winds of the plot will blow while maintaining the integrity of the characters. Just very good, solid writing by a highly polished author.
October 29, 2024
Fantastic Finale
Wow! This series started with Incursion and I was hooked. Every book kept getting bigger and better, and this finale was explosive. Sarah Hawke really brought this one home. Kal’s been on an incredible journey.
The writing was top-notch, the steam was scorching, and the romance was well done. These character arcs really came to fruition.
Wow! This series started with Incursion and I was hooked. Every book kept getting bigger and better, and this finale was explosive. Sarah Hawke really brought this one home. Kal’s been on an incredible journey.
The writing was top-notch, the steam was scorching, and the romance was well done. These character arcs really came to fruition.
August 23, 2025
Enjoyable
Overall, well written and a fun read. Very nice balance of the different characters and themes with a little critique typical of multiple books in a series. Almost every author seems to get wordy trying to stretch the storyline.
The writer shows great promise in future endeavors.
Overall, well written and a fun read. Very nice balance of the different characters and themes with a little critique typical of multiple books in a series. Almost every author seems to get wordy trying to stretch the storyline.
The writer shows great promise in future endeavors.
December 10, 2024
WOW!!!
An absolutely amazing universe the author has created for us the reader!!! If you don't get lost in this series for hours and hours you aren't appreciating what the author has created!!! I can't wait for more!!! Outstanding!!!
An absolutely amazing universe the author has created for us the reader!!! If you don't get lost in this series for hours and hours you aren't appreciating what the author has created!!! I can't wait for more!!! Outstanding!!!
December 31, 2024
Great Ending
This was a great ending to this series and that the MC and his girls got the end they deserved.
While there are still some unresolved issues in the end, it's already stated that the story will continue in a new series, so I am looking forward to this continuation.
This was a great ending to this series and that the MC and his girls got the end they deserved.
While there are still some unresolved issues in the end, it's already stated that the story will continue in a new series, so I am looking forward to this continuation.
March 4, 2025
This is a satisfactory but rushed ending to the series. It starts off great but it feels like Sarah realized she had done too much, was over 3/4 of the way into the story then remembered it is the last book in the series and she actually needed to end the book so we run right into the finale.
November 4, 2024
A fitting conclusion
You've stuck around this far so there's not much to say. The series wraps with the same level and quality as it started. I'm happy with it
You've stuck around this far so there's not much to say. The series wraps with the same level and quality as it started. I'm happy with it
November 22, 2024
A great series
I really enjoyed the series & I look forward to the characters reappearing in the next set of books. Recommended.
I really enjoyed the series & I look forward to the characters reappearing in the next set of books. Recommended.
December 14, 2024
Great Story
This is a wonderful completion of an excellent series. The book wraps up the story of our heroes as they work to solve the outstanding issues.
This is a wonderful completion of an excellent series. The book wraps up the story of our heroes as they work to solve the outstanding issues.
March 18, 2026
I wish this series would continue.
October 26, 2024
It felt like there wasn’t really anywhere left for these characters to go, as they’re a bit one note, but luckily it all got wrapped up before I became too bored to continue. If only every author were so self-aware.
Displaying 1 - 14 of 14 reviews





