Castle 7x10: Bad Santa Synopsis

When an ER physician is gunned down in the street, Castle and Beckett soon discover that the victim was a mob doctor to a Mafia family run by an old friend of Castle's. Also, against this backdrop of Christmas, Esposito and Lanie reach a defining moment in their relationship. MONDAY DECEMBER 8 (10:01-11:00 PM., Eastern Time) on the ABC Television Network.