I found this compelling. Purchased during a three hour flight delay. By the flight I was hooked. As my first it totally held my interest.

With nods to the past but introducing plenty of new material, this book is definitely the best of the Sigma series to date.

Another blockbuster from James Rollins. This edition of the Sigma series takes us from Yellowstone to Antarctica as they try to stop another earth extinction event. Once again great writing with an all star cast leads us on a non stop action adventure. Highly recommend you read this series.

I thoroughly enjoyed this book. It was full of adventure and interesting characters. A real page turner. I didn't want it to end b

Great story and fast pace adventure! A must read!

I have been reading through the series of late. One question I have been asking is this; if Sigma Force is so secret and elite why is it that every bad guy knows about them and is always a step ahead. Their like the Keystone Cops until the very ending when they save the day. I know this series is not fine literature, but geez, do they have to be so predictable? Plus, after checking on some of his sources that he recommends, they are conspiracy laden tomes that can't be taken seriously. So his "facts" sometimes come from doubtful sources.

Another great book in this series! I can't wait to start the next book!

Thought it starts well, half way through it takes the routine path & the ending seems so obvious.

The Scientists are only slightly less beautiful than the Special Forces agents, and all are brilliant. Good wins out.

Yet another book that goes down to the last few seconds to save the world from disaster. Tedious, ponderous and completely unnecessary. Couple that with a plot hopelessly complicated and you have a less than fulfilling read.

Being both a science teacher and an action reading enthusiast, I have always jumped at every new Sigma series novel that comes out. This novel was pretty good but not necessarily the best. I do miss the prolonged battle scenes of past books but did love the plot throw-back to Subterranean. I do hope James you are reading this and if so, I implore you, please bring back the original buddy team of Gray and Monk. That dynamic was so great and I have no idea why you have chosen to shelve Monk in the last couple of novels. Kowalski is entertaining but comes across more like Gray's "pet" commando - he is definitely no Monk.

...or at least his laptop. There's some fun science play here, but this is by far the weakest link in the Sigma chain. No Seichan. No Guild-like enemy (hell, the villain in this one even has a moral comeuppance). Not to mention a fairytale wedding...gross. All is not lost, Rollins does hint that there is more of the Sigma formula to come and I'm hooked. Let's just hope there's no more Once upon a time...and they all lived happily ever after.

Good book. Wish I had read the authors notes first.

Thoroughly enjoyed the book and the story. I must admit it kept me up late several nights not wanting to put it down. Thanks for a great read.

Always good.....

Can't wait for the next one!

The book started off well, but then quickly spiraled out of control and into a quick death that left the reader disappointed and wishing for a better story line that held together.

Not bad, not great. Couple of hammy scenes but all in all, it makes you think. Would make a good movie.

This is the best yet in the SIGMA series. I couldn't put it down.