Castle (2009): Season 4, Episode 15

4 - 15: Pandora

In the first episode of a two-part "Castle" event, Castle and Beckett pursue a ruthless killer who, they discover, is part of a sinister, international conspiracy. Castle and Beckett are joined on the case by Sophia Conrad, a smart, sexy CIA operative who has a complicated past with Castle. Josh Stamberg, also guest stars as Martin Danberg, an intelligence officer.