Black Water — T. Jefferson Parker

A beautiful young woman is dead in the bathroom of her home. Her husband--a promising young cop named Archie Wildcraft is shot in the head, but still alive. It looks like an attempted murder/suicide, but something tells Detective Merci Rayborn that there's more to this story. When the suspect vanishes from his hospital bed, he draws Merci into a manhunt that leaves the entire department questioning her abilities and her judgment.