This is the latest Sigma Force novel by James Rollins. I have read all of the others. I do not provide many details about the story as I do not want to ruin it for other potential readers.
This novel focuses primarily on Joe Kowalski while including all of the other characters in the series with Painter Crowe making a very brief appearance.
The plot line revolves around the great leap in human intelligence approximately 50,000 years ago and how it may have taken place. As with the other Sigma Force novels this one is a fast read. While entertaining, this one, I felt, was not quite up to the standards of the other Sigma Force books.
I recommend this book for any readers who have been following the Sigma Force series, but recommend for others that you start with the first one as this one is not meant to be a stand alone novel.