A mutilated female body is discovered tied to the undercarriage of a bus carrying prisoners from a women's correctional facility after a severed arm flies out from beneath the vehicle and strikes a car. Catherine leads the investigation and at first believes the woman was escaping, but the evidence increasingly points to murder. Back in town, Warrick probes the death of a gambler who was stabbed multiple times in his brother's kitchen.

A high roller who spent the night with a woman he had just met is found dead on the loading dock of the casino where he was staying. The investigation reveals that the victim won $10,000 in a pool game and was an assistant to a respected movie producer.