An earthquake hits Seattle, trapping Maggie in a lift and threatening Meredith's long streak of successful surgeries.
When a Navy lieutenant is found murdered, the team interview his strange neighbours; Torres and Palmer have a night out and face the consequences.
The team investigates when a stock broker, who moonlights as a stripper, is murdered; after a 24-year absence, Booth's mother returns.
A famously reclusive author, and Castle's idol, is found dead, and Castle vows to solve the murder. The further he and Beckett get into the investigation, the more they realise that truth is stranger than fiction.
The crew encounters the Krenim's ultimate weapon in the form of a ship that can erase its enemies by altering time.