Sigma Force must be the worst kept secret in the American security forces. The guild knows their every step and is always a step ahead. The only way Sigma succeeds is ludicrous three man attacks against whole hordes of mercenaries. Once you read one book, it is pretty much the same thing over and over again.

Fantastic book! I am astounded by the facts and research that went into this book to make such a great work of believable fiction. I loved the characters and the action and suspense were never-ending. A GREAT READ!!!

Rather far fetched. A real reach in order to develop action and some sort of suspense. Seems like a filler novel just to keep the a commitment to the publisher or cash flowing. One step above a middle school novel.

A very good book. Alot of action....I love the Sigma Series. I can't wait to read the next book in the series.

I have read a good portion of James Rollins books and they have not disappointed. The historical tie in to this fiction book was fascinating. Looking forward to the next book(s).

Another great book from JR...I still put the last Oracle as his best...and I'd put Judas Strain ahead of this book but it was still very entertaining to read and I look forward to his next two books...keep them coming JR

Kept my interest but not too complicated. Surprised to see Columbia, TN pop up. I work there. I would definitely recommend.

Rollins always brings it. Great read and full of action, science and intrigue. Mixing fact with fiction. Can't wait to read bloodline.

Superb! Mastery in continuing the Sigma series ever forward. The blending of fact and fiction into an enlightening and entertaining read only gets more poignant with each new book in this series.

Being a science teacher I totally love the whole "scientists with gun" approach to the Sigma series. I appreciate how well Rollins weaves in history and science I to his novels. That being said, The Devil Colony was a fun read but definitely not the best in the Sigma series. Painter Crowe is a really good character but he is definitely not a lead character so it kind of came across as awkward switching from two different story lines. If you're a Sigma fan, it is still a good read but if you are new to this series, definitely start at the beginning or else you probably will not be anxiously waiting for the next one like I am.