Before He Kills Again — Margaret Murphy

A serial predator is on the prowl in Liverpool—seven victims so far—and he’s already chosen his next one. The police can’t catch him. He leaves no trace. No one has been able to provide a reliable description. Detective Cassie Rowan goes undercover in a dangerous game of cat and mouse through the teeming backstreets of Liverpool. But how long will it be before he turns the tables and begins hunting her?