Jane almost drowns while investigating a fireman's murder and loses his memory, turning him into his old con man self.
Castle goes under cover at an elementary school to try to find a student who may have information about the shooting of an ice cream vendor.
When the team treat a six-year-old with multiple health issues, they must collaborate with her doctor mother; Wilson and House go on vacation.
The marshals try to figure out who killed a witness security officer and why. Boyd tries to use his last hours behind bars to take revenge on Dickie.
