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Publisher's Summary

After successfully freeing Alliance POWs, "Black Jack" Geary discovers that the Syndics plan to ambush the fleet with their powerful reserve flotilla in an attempt to annihilate it once and for all. And as Geary has the fleet jump from one star system to the next, hoping to avoid the inevitable confrontation, saboteurs contribute to the chaos.

BONUS AUDIO: Includes an exclusive introduction written and read by author Jack Campbell.

Get Lost! Listen to the rest of the Lost Fleet series.
©2009 Ace; (P)2009 Audible, Inc.

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Average Customer Ratings


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  • Chance
  • Monroe, LA, USA
  • 04-30-09

Listen to the complete series

This is a great book, but don't try to listen to it as a stand alone or before the first books. But this is a good thing, you get to listen to first four before this one! This I highly recommend!

16 of 16 people found this review helpful

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Love this series

I bought the first book in this series during the penny a minute sale and boy did that work out for Audible :) Throughout the first five books the story is excellent and the space battles are both intellectual and exciting (which is a rare combination). Our hero, Captain Geary, has to outwit both his enemies and his allies through many twists and turns. I can't wait for book six!

11 of 11 people found this review helpful

  • Overall

Was the Wait Worth It?

It absolutely was! Now, the previous reviewer is quite right, this book is a spectacular payoff to a long and heroing journey that has built to a thrilling sprint to safe territory. The thing is, that the challenges are growing more unforgiving for the men and women of the Alliance Fleet; they range from smarter enemies, to saboteurs and more mysterious threats. Along the way, the author also fills in some background about how the hero came to be where and when he is and why that has haunted him since his reawakening. The fantastic space battles are still here, and so is the very heavy, clawing urgency of military needs, the limitations of logistics, time and human mortality. The costs the fleet and its commander pay to get home are high, and reaching safety does not mean the end.
I could not believe the wait required for this book. I am entirely satisfied. If you read and liked the previous four, I’m sure you already have it or will get it at the earliest opportunity. If you haven’t read them, start with the first, Dauntless, and enjoy the ride as we all wait for the sixth book, Victorious.

9 of 9 people found this review helpful

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  • Jean
  • Santa Cruz, CA, United States
  • 02-17-12

Great series

I started the series with book one and have read in order. This is the next to the last book in the series and I can hardly wait to start the last book. Christian Rummel did an excellent job narrating the series. In this book the Fleet is almost into Alliance space and after a spectacular battle to free POWs the fleet finally discovers who the saboteurs are. Now they are almost home the Fleet is a cohesive fighting unit and the esprit de corps is there. One more book in the series then I am done I sure hope Campbell has some other interesting series to read.

8 of 8 people found this review helpful

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  • Craig
  • Tucson, AZ, USA
  • 06-13-09

Not Normally a Series Fan

Not normally a series book fan, I have really enjoyed this story, I am so drawn in I feel like a crew member of the Aliance Fleet.

7 of 7 people found this review helpful

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  • Joe
  • Modesto, CA
  • 05-01-09

Great Series

I loved this series of books. Great reading. I cannot wait for the last book in the series. There is a lot of dialog that is very similar throughout the series, but it comes through as being natural. The writing is natural and doesn't seem forced. Cambell is a good story teller.

7 of 7 people found this review helpful

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  • Dan
  • El Paso, TX, United States
  • 09-14-09

Excellent Sci-Fi series for grown-ups

Enough action to keep things moving, but by far, this series excels in creating real life human experiences.

6 of 6 people found this review helpful

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  • Richard
  • Timberlake, NC, USA
  • 07-20-09

One Of Sci Fi's Best

This series was absolutely one of the best to which I have listened. The author's detail in describing space travel at such distances and the detailed battle sequences are very believable. I could see them while I was listening and I was transported there. I hope the "Black Jack" Geary character will be back soon!

5 of 5 people found this review helpful

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  • Katherine
  • St. Johns, FL, United States
  • 06-19-13

Good deeds pay off

Originally posted at FanLit:

In Relentless, book 5 of Jack Campbell’s LOST FLEET series, Captain Black Jack Geary and the Alliance fleet are jumping through a Syndic star system, trying to evade the Syndics, as usual, when they happen to be in a position from which they can rescue some Alliance POWs from one of the Syndic planets. Here the Alliance force sees the consequences of their past honorable behavior which Captain Geary has insisted upon, despite earlier protests from many in his fleet. Their good deeds are bearing fruit.

Because of this, most of the other captains now trust Geary completely and some of the more reluctant ones are starting to buy in. Unfortunately, Geary himself is feeling very insecure and is sometimes paralyzed by fear of failure. He’s also still dealing with a few secret saboteurs who clearly don’t want him returning home in glory. While some of his colleagues are ready to crown Geary emperor, a few would like him out of the picture and they are willing to sacrifice ships and personnel to make that happen.

Another problem is the discovery that the fleet is being hunted by a massive Syndic reserve flotilla. Where have the Syndics been keeping all these ships and what are they for, if not for fighting the current war with the Alliance? And then, of course, there are the imploding hypernet gates, which have everyone feeling a little twitchy.

On a personal level, Geary is still dealing with the jealous rivalry between the captain of the flagship and Madam Co-President. (I’m a little annoyed at how silly these women are acting.) Another woman enters his life in this installment, too — Captain Jane Geary, his grandniece. He’d like to have an avuncular relationship with Jane, but she is reluctant (for good reason) to get too close. By watching her, Geary can see what it was like to grow up in a society that’s been at war for 100 years — a society where her own granduncle was the war’s greatest hero.

As usual for the LOST FLEET books, Relentless offers plenty of military action, epic space battles, a cool ground war, clever intelligence operations, political intrigue, interesting ethical considerations, and social commentary. As I’ve said in my past couple of reviews of the LOST FLEET books, this series could have been condensed considerably. While the plot progresses in Relentless, there is a lot of repetition and the plot uses many of the same elements we’ve seen before. Important things happen, so it’s a necessary installment (all of them are) but I can’t help but feel that I’m being milked. Fortunately, I enjoy Black Jack Geary’s company, so the feeling isn’t too aversive.

Readers who have been engrossed in the story so far and just want to hang out with Geary and the fleet will be pleased with Relentless. I’m happy, however, that the series is ending (sort of) in the next book, Victorious. (There are spin-off series that continue the story.)

Just an aside: I’m not sure what’s up with the cover art for this series. Most of the covers show Captain Geary on the ground with some kind of big weapon. These scenes never happen in the books. He doesn’t carry big weapons around and his feet rarely touch the ground outside of a space ship.

4 of 4 people found this review helpful

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  • Thomas
  • Fredonia, NY, USA
  • 09-10-09

Not a space warfare guy

I am not into all that military war stuff, but I cannot wait for the next one. This series continues its hold on me after every book.

8 of 9 people found this review helpful

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  • M. O. Butler
  • 12-29-09

excellent series

I could not stop listening Looking forward to the next one

2 of 2 people found this review helpful

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  • Sir Greggor
  • 02-02-18

Black Jack at his best !

Your wasting time reading this as you should aready have this in your collection !

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  • Paul A. Adams
  • 09-15-17

A real joy

I have really enjoyed this series and look forward to the next book and the new complexity that will be revealed.

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  • Ho-Man Yau
  • 09-01-17

finally home

almost there, just one more book and and then it's all over, until the next set of books and stories.

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  • joel
  • 01-18-16

fantastic, intelligent and inspiring!

Series explains about some people and tactics, I have started to use the tactics in real life, in a good way like Geary ofcourse ;)

1 of 1 people found this review helpful