Castle and Beckett investigate the murder of a Wall Street trader, but the case takes a shocking turn when the they discover the victim was an undercover informant for the…

Kim takes time off. Jimmy tries to make amends. Nacho gambles with his future. Hamlin pushes Chuck to make a decision.

Jimmy visits an old friend and takes up a new pastime. Chuck and Hamlin spar over the future of the firm. Kim faces challenges at work.

Jimmy is pushed to desperate measures. Nacho picks up a new skill. Mike explores an alliance. Kim stands up to Hamlin.

Jimmy has a new endeavor. Chuck pushes himself to the limit. Nacho finds himself in a power struggle.

To keep a potentially messy situation from unraveling, Mike brokers a deal. Jimmy works to exonerate an eccentric client.