«The Boyfriend» by Thomas Perry

Five cities. Five escorts. Five bullets in five heads.

Catherine Hamilton was a high-class hooker. Now she is dead. Jack Till, private detective, has linked her murder to a string of other killings: the cities may be different, but the girls all look uncomfortably alike. Now he knows the killer's type, it's a race against time to find the next victim before it's too late…

Who will the boyfriend seduce next?