Excellent! Nuff said....

I absolutely can’t get enough of the Sigma series!!! Love the combo of historical & scientific. Characters are believable & Kowalski just cracks me up! Can’t count how many times I’ve read the series & will continue to!

And I’m on to the next one! P. S. Women rule!

All can say is WOW ! These Sigma series books are awesome ! So much action with so many plot twists you just can’t put ‘me down. Great characters with a great storyline in each one just leaves you begging for more. Highly recommend them.

Couldn't put this one down either!

Fast paced action, characters continue to evolve holding to the previous story lines.

Loved it. All the characters back in place with a fantastic and futuristic story. I love his books, even if rescue always comes down to the last second. Rollins, to me, is always a good read and i hope that Sigma will find many new cases to solve.

Another great novel by James Rollins! My advice to the author-keep doing your own work. It is much more interesting than when you share the writing with others. I haven't had the chance to check out the sources referenced at the end of the book, but I truly love this part. I have learned a lot by reading some of these in the past. If you're a Sigma fan, you will love this book.

One of James Rollins best books. I can't wait till the next Sigma adventure....thanks!

James Rollin's books are my guilty pleasures. When i pick one up i can' t put it down! Their a nonstop thrill ride, and this one was no exception. Love all his books but SIGMA's are my favorites.

As usual James Rollins has written a great story. Hard to decide who my favorite character is, Kowalski comes in a close first, only because of his one lines!

I am speechless! By far, the best action book of 2012. If you are a sigma force fan, be prepared for the surprises and more surprises. Read this book in 2 days. Absolutely, wholeheartedly an amazing book. James Rollins Rock!

In true Rollins fashion, BLOODLINE was an amazing read. I simply could not put this book down. Rollins is a master of blending science and historical facts with fiction, into non-stop action. Read this book!

I have read every Rollins book and this one is the best yet. The inclusion of real world science and existing history within the ongoing adventures of Sigma and its growing cast of characters makes for an amazing, exciting and inspirational read.

I really enjoyed reading this book. At most moments I fought to put it down.

This book is good! Very good! It has a lot of twist & eye openers.

AMAZING!!!! Didn't want it to end.

Very good book. I had a hard time putting it down.

Fantastic. I could not put it down. Am searching out his other novels.