Castle season 2 episode 2. When two separate murders are committed on the same time, Castle wagers Ryan and Esposito that he and Beckett will work theirs first. The frenzied rally to seize their individual killers and win the bet leads each investigative duo to a likely doubt, only to discover that they both have airtight alibis. But eccentric twists in both cases power the two teams to occupation together to unravel the mind-bending puzzle behind each slaying.