Ep 19. 47 Seconds

In season 4 episode 19 of Castle titled "47 Seconds," Castle and Beckett investigate a shooting at a protest rally that leaves a young woman dead. As they interview witnesses and gather evidence, they realize that the shooter had a very specific target in mind and did not intend to harm innocent bystanders.

In the midst of the investigation, Castle and Beckett find themselves at odds over an interview Beckett gives to a local news station. Beckett's honesty about her feelings towards Castle's recent behavior causes tension between the partners, and they struggle to maintain their working relationship.

Meanwhile, the victim's family deals with their grief and the police department mourns the loss of one of their own. As the investigation deepens, Castle and Beckett must navigate their own personal issues while trying to solve the case.

As the clock ticks down, Castle begins to piece together the shooter's motive and identity, but they must act quickly before he strikes again. With tension running high and the stakes even higher, Castle and Beckett must work together to bring the killer to justice and restore balance to their partnership.