As Castle and Beckett investigate the ritualistic murder of a young woman, they find strange symbols in the victim’s apartment; Castle struggles with Alexis’ decision to move in with Pi.

Sam and Dean investigate a murder and find Garth is already on the case. Dean is not happy to learn that Garth has assumed Bobby’s duties, but Garth points out…

While battling a demon, Dean is electrocuted, resulting in permanent damage to his heart and leaving him with only a couple of months to live. A despondent Sam searches desperately…