A Walk Among The Tombstones by Lawrence Block

Used

Big-time dope dealer Kenan Khoury is a wealthy man, and it comes as no surprise when his wife Francine is kidnapped and a ransom demanded. Kenan pays up and his wife is duly returned to him - in small pieces left in the boot of an abandoned car, leaving private eye Matt Scudder to speculate on the motives of a very unusual kidnapper. Soon he is on the trail of a pair of ruthlessly sadistic psychopaths whose insanely cruel games have only just begun...