Jake surprises Amy with an investigation into a string of arsons connected to her favorite crossword puzzle author, Vin Stermley. Meanwhile, Gina helps Holt jazz up his Commissioner candidate speech, and Terry, Rosa, Hitchcock and Scully argue over who is most deserving of the new detective car.

Jake invites his newly discovered half-sister to stay with him in New York, but when he and Amy realize she's a bit of a nightmare, they must find a way to get her back home to Dallas.