In the Blue Moon agency Christmas atmosphere is all around. David got the idea to make "Santa's Hotline" in the agency and Maddie is going crazy wishing that Christmas would end soon. Meanwhile a man named Joseph is murdered by criminals he testified against and his wife, Mary, after escaping from their apartment leaves her baby in Agnes's apartment. Maddie says that they should turn the baby in to the police and David says that they should leave the baby to Agnes. But David manages to convince her to investigate and doing so they meet the three Kings, FBI agents who investigate the murder. The baby's mother eventually turns up at Blue Moon, but Agnes and the baby are gone, and are eventually found at Maddie's house being held at gunpoint by the criminals who killed Joseph. In the end the cast, crew, and their families sing a Christmas carol to the viewers.