Plum lovin': Mysterious men have a way of showing up in Stephanie Plum's apartment. When the shadowy Diesel appears, he has a task for Stephanie - and he's not taking no for an answer. Annie Hart is a "relationship expert" who is wanted for armed robbery and assault with a deadly weapon. Stephanie needs to find her, fast. Diesel knows where she is. So they make a deal: He'll help her get Annie if Stephanie plays matchmaker to several of Annie's most difficult clients. But someone wants to find Annie even more than Diesel and Stephanie. Someone with a nasty temper. And someone with "unmentionable" skills. Does Diesel know more than he's saying about Annie Hart? Does Diesel have secrets he's keeping from Stephanie and the two men in her life - Ranger and Morelli? With Stephanie Plum in over her head, things are sure to get a little dicey and a little explosive, Jersey style! Plum lucky: Stephanie Plum has a way of attracting danger, lunatics, oddballs, bad luck ... and mystery men. And no one is more mysterious than the unmentionable Diesel. He's back and hot on the trail of a little man in green pants who's lost a giant bag of money. Problem is, the money isn't exactly lost. Stephanie's Grandma Mazur has found it, and like any good Jersey senior citizen, she's hightailed it in a Winnebago to Atlantic City and hit the slots. With Lula and Connie in tow, Stephanie attempts to bring Grandma home, but the luck of the Irish is rubbing off on everyone: Lula's found a job modeling plus-size lingerie. Connie's found a guy. Diesel's found Stephanie. And Stephanie has found herself in over her head with a caper involving thrice-stolen money, a racehorse, a car chase, and a bad case of hives.