<i>Castle</i> Castle

On Monday's episode of Castle (10/9c, ABC) Detective Beckett (Stana Katic) and Castle (Nathan Fillion) investigate the murder of a man who appears to have a double identity, a concept not unfamiliar to the show's creator, Andrew W. Marlowe.

Check out photos of the Castle cast

Castle picked up for full second season

Castle: Is a Beckett-Castle kiss in the cards?