Ep 20. The Limey

In season 4 episode 20 of Castle titled The Limey, Richard Castle and Kate Beckett investigate the murder of a young woman who was found dead inside a car trunk. The victim had a distinct British accent, which leads the detectives to believe that the murderer may also be from the UK.

To help with the investigation, Scotland Yard detective Colin Huntley travels to New York to assist with the case. Huntley is a charming and confident detective, who immediately catches Rick's attention. Although Kate is initially resistant to the idea of having a foreign detective working on their case, she soon realizes that Huntley may provide the fresh perspective they need to make a breakthrough in the case.

As Castle and Beckett continue their investigation, they discover that the victim was involved in the music industry and had a tumultuous relationship with her ex-boyfriend. With the help of Huntley, they begin to piece together the victim's last moments and find a new suspect.

Meanwhile, Castle becomes increasingly intrigued by Huntley's life in London and asks him to show him around the city if the case is solved. Beckett becomes jealous of their friendship, and tensions rise between the two detectives.

As the case progresses, Castle and Beckett are forced to navigate their different approaches to the case, with Beckett focused on hard evidence and Castle more interested in the emotional connections between the victim and suspects. However, they both soon realize that their unique perspectives are necessary to solve the case and bring the killer to justice.

In the end, the investigation takes several twists and turns, and the killer is finally revealed. Castle and Huntley say their goodbyes, and Beckett and Castle come to a new understanding about their partnership and friendship.

The Limey is a thrilling and suspenseful episode that showcases the unique dynamic between Castle and Beckett and the ways in which their partnership is constantly evolving. With a captivating storyline and charming guest star, this episode is not to be missed.