Beckett and Castle face the consequences of their decisions during a high-stakes investigation.
Castle and the boys, along with a new NYPD detective, Sullivan, investigate the murder of a former child star. The case takes a turn for the worse when Beckett and McCord arrive.
A grisly murder investigation leads Castle and Beckett to a suspect who claims he's travelled back in time to stop terrible events from unfolding.
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.
Coulson and the team discover exactly what their captors' true intentions are, but in space, escape is not an option.