Chasing the Dime by Michael Connelly

Henry Pierce has just moved into a new apartment but the first time he checks his phone messages, he discovers that someone had the number before him. The messages are for a woman named Lilly and she is in some kind of serious trouble.

Pierce is inexorably drawn into Lilly’s world, a night-time world of escort services, websites, sex and secret identities. Every step Pierce takes leads him to abandon his own life in a frantic race to save the life of a woman he has never met, as he is faced with a decision that could cost him everything…