Showing Loves Music, Loves to Dance by Mary Higgins Clark

Erin and Darcy, answering personal ads as research for a TV show, discover a whole new New York sub-culture - adulterers, con men, the shy and frankly weird, all looking for love. And one man looking for something darker . . .

A serial killer who has just got away with murder for fifteen years, and has promised himself just two more . . .