Ep 13. I, Witness

In the Castle season 7 episode 13 titled "I, Witness," Castle and Beckett are faced with a gruesome murder case when a woman is found dead in her apartment. This murder is especially unique as it was filmed by the victim's own webcam, allowing the detectives to have access to footage of the crime.

As Castle and Beckett delve deeper into the case, they begin to suspect that the killer may be someone in the victim's online community. They interview several of her friends and followers, including an online conspiracy theorist, a self-proclaimed psychic, and even a man who claims to be a time traveler.

Meanwhile, Castle and Alexis have a heart-to-heart conversation about her future plans. Alexis reveals that she is considering going to law school, which Castle is supportive of but also hesitant about, as he fears she may be putting her life in danger.

The case takes a surprising turn when a key witness, who was present during the victim's murder, comes forward. However, with the killer still at large, Castle and Beckett race against time to apprehend the perpetrator before they can strike again.

Throughout the episode, there is a sense of urgency and tension as the detectives work to solve the case. The use of technology in the investigation adds a unique aspect to the plot, and the different suspects provide a range of potential motives for the murder. Additionally, Castle's concern for Alexis' safety adds a personal touch to the episode and showcases his character development as a father. Overall, "I, Witness" is a suspenseful and engaging episode of Castle.