Secret Prey by John Sandford

A wealthy banker is dead, shot once in the chest during a hunting trip. There are many reasons for him to be killed, and many people who would do the deed. But who did?  Lucas Davenport has an idea. But this routine murder investigation is about to turn into something different. A cat-and-mouse game with a killer who does not hesitate to take the fight to Lucas himself. And those he loves…