Maggie McFarlin joins former Detective Mike Marker in solving the mystery of who scammed his 92-year-old aunt out of her life savings. Mike's sister, Joanie, the Branch Manager, is convinced that the culprit is someone on her team, all of who will be on a company-sponsored cruise. Mike and Maggie agree to go undercover to find out who, but when one of the bank employees goes overboard, Mike and Maggie now have to find a murderer and save his sister from prison.