In book two of the Jack Reacher Cases, written with permission from Lee Child, the body of a man who was murdered is discovered. In his pocket is a toothbrush and an ATM card with the name Jack Reacher. 

Lauren Pauling, a former FBI agent, is asked to identify the body. 

But instead, she investigates the murder and soon finds herself a target in a complex web of murder, betrayal, and vengeance.