Ep 22. Undead Again

In the season 4 finale of Castle, entitled Undead Again, the team is faced with a gruesome case involving a murdered woman who is found with strange symbols carved into her body. The evidence suggests that the victim was involved in the occult and the team soon discovers a series of cult-like killings that are occurring throughout New York City.

As Castle and Beckett investigate the case, they become convinced that the killer is a modern-day vampire, preying on vulnerable women and performing ritualistic murders. With the help of the victim's sister, who is an expert in the occult, they begin to unravel the mystery behind the killer's motives.

Meanwhile, Castle is dealing with his own demons as he struggles to come to terms with his relationship with Beckett. After a year of dancing around their feelings, he finally confesses his love to her, but is left heartbroken when she does not reciprocate. Their relationship reaches a breaking point as Beckett is forced to confront her own feelings and priorities.

As the investigation intensifies, the team begins to close in on the killer, but they soon realize that he is hunting them as well. With the clock ticking and the stakes higher than ever, Castle and Beckett must confront their own fears and desires, both in their personal lives and in their pursuit of justice.

Undead Again is a thrilling and suspenseful finale that keeps viewers on the edge of their seats, with a satisfying conclusion that will leave fans eagerly anticipating the next season. With strong character development, complex plotlines, and a touch of the supernatural, this episode encapsulates the best of what the beloved crime drama is known for.