A dying man leaves a baby with a priest; Castle and Beckett end up taking care of the baby while they investigate.
When a woman who looks very similar to Lanie is murdered, the team thinks the killer may be targeting members of the 12th precinct.
A well-known relationship therapist is murdered.
Alexis asks Castle for help proving a death row inmate's innocence 72 hours before his execution, but they uncover a secret that could seal the man's fate.
When Beckett steps on a pressure-sensitive bomb, the team searches for a way to save her while Castle distracts her by talking about their relationship.
Castle: 'A Deadly Game'
The Mistress Always Spanks Twice: Preview
Castle Sneak Peek
Cast members Nathan Fillion (Richard Castle), Seamus Dever (Kevin Ryan), and Jon Huertas (Javier Esposito) reenact a fight scene from "The Blue Butterfly." Seamus notes that he married his real-life wife, Juliana Dever (Jenny Duffy-O'Malley), on the show.
Castle - Sneak Peek
Castle sneak peek.
Watch a sneak peek of the season premiere.
Castle: 'Close Encounters of the Murderous Kind' Sneak Peek
Dean of Thieves: Preview
Nathan Fillion and Stanya Katic talk about the second season of their detective series.
Cast members Tamala Jones (Lanie Parish), Ruben Santiago-Hudson (Captain Roy Montgomery), Jon Huertas (Javier Esposito), and Molly Quinn (Alexis Castle) talk about Twitter and say Nathan Fillion (Richard Castle) is to blame for starting them to tweet.
Castle sneak peek