A CSI team investigates a mysterious death at Charlie's house. George Eads ("CSI: Crime Scene Investigation") makes a cameo appearance.
The squad is called in to identify the victim and track down a killer when a severed human foot washes up on shore.
Moseby is embarrassed when his grandmother comes to stay at the Tipton. However, the boys find her help with a project about the '40s invaluable. Meanwhile, London's father makes her get a job.
Mac wrestles with a demon from his past when he confronts a killer who was released from jail because of his actions, and Danny and Hawkes investigate the case of a man poisoned with lethal ricin.
Desperate to earn some money, Max agrees to play Santa Claus at Penny's charity event. Meanwhile, Jane tries to reclaim the money that she and Brad had saved for their holiday after she mistakenly gives it to the housekeeper.