The Third Man
composed by Anton Karas

As Castle and Beckett investigate the death of a possible serial squatter mixed up in a multi-million dollar heist involving exotic animals and diamonds, Castle tries to hide from Beckett the fact that a newspaper that ranked him as one of the city's most eligible bachelors also linked them romantically. While Castle relishes the moment by agreeing to a date with a woman ranked by the newspaper as one of the city's most eligible bachelorettes, Beckett makes romantic plans of her own with Lanie's help.