Vin Cooper returns to action in A KNIFE EDGE when he's sent to investigate the suspicious death of Dr. Hideo Tanaka. Tanaka and his partner, while exploring a deep sea trench near Japan, discovered a bacterium that could be dangerous to the entire world. Shortly thereafter, Tanaka ends up in the belly of a Great White shark. Once Cooper arrives, there's not much evidence left that would make it appear to be anything but an accident, but his instincts tell him there's something worth investigating.

Back at the Pentagon, Cooper is wrapping up his investigation of the shark attack when terrorists attack San Francisco. He's sent to help and discovers that one of the victims is Tanaka's partner from his previous case. Not long after this, Cooper is pulled away to investigate another case, this one involving the death of a former military friend. While all of this is going on, Cooper also is trying to deal with his on-again/off-again relationship with Major Anna Masters, who helped him in Rollins' previous novel, THE DEATH TRUST.

Vin Cooper is my kind of action hero. The character David Rollins has crafted is a wise-cracking, no- nonsense kind of guy. Cooper is very good at his job, even when the situations he finds himself in are not his idea of a good time. He deals with them like a real person would -- a real person who also has really, really good luck. The one caveat about this book is that the story jumps around a little too much. It's not hard to follow, but by the end of the story, you feel like maybe Vin Cooper had been put on one too many cases and that there were maybe one too many coincidences. Otherwise, it's a really fun, fast-paced, action-packed read.