Since killing a man in New Orleans Mercy's kept her head down. With diet, exercise, and work, she thinks she can keep wolves and memories at bay. She's wrong. The Costilla gang wants revenge and Mercy will pay with her life if they can get to her.
Her father, Tommy Watts, decides to send her to an isolated castle with an ominous past owned by a pair of innkeepers with no past at all. Tommy's solution is simple. He'll take care of the Costillas while Mercy's tucked away out of sight in the countryside. If only he hadn't sent her cousins with her, three girls with issues and a lot of duct tape. Dad said Mercy would be safe there, but she's the only one. The castle is hosting a baseball camp and the competition is about to get fierce and deadly.
The Fibonacci family saved Mercy Watts’ life and now she owes them a favor. Calpurnia Fibonacci calls on Mercy to make good. When you’re dealing with a powerful mafia family, refusing isn’t an option. So Mercy travels to Paris, home of the Louvre, catacombs, and secrets, to search for the identity of a woman glimpsed for just a moment on the fashionable Rue Cler and some answers to a few family mysteries of her own. To make matters worse, Chuck and Aaron tag along and they have agendas of their own. With the mafia and the shadowy Klinefeld Group involved, finding the wife of Riley will be much more dangerous than she ever expected.
Mercy Watts is trying to recover from a tumble through a rocky river, but crime just won’t let her be. A retired librarian takes a life and Mercy takes her case under duress, of course. Soon she’ll be drawn in by this unusual criminal and she’ll have a choice to make with painful consequences.