Wow! I love this author! The medical theme of a Robin Cook novel, the adventure of a Cussler tale and the puzzling, fast-action, code-breaking ride of a Dan Brown bestseller. Plot: the special (secret) agency of Sigma is up against the Guild again when double agent Seichan pleads with Grayson Pierce for help in finding a way to stop a horrible bacterial strain from killing the world. The trail for answers starts with Marco Polo's hidden clues. History, science, evil and religion all collide in this terrific race for the cure. Even sci-fi fans would love this amazing book. Do I have any criticism? Yup, but it's my usual rant against his proofreaders who missed the typos and who also did not advise Rollins to beef up his many short and choppy paragraphs. This is minor - the story is first rate.