Lewis and Kellerman take a road trip to extradite a Baltimore murder suspect from Pennsylvania. It should be an easy assignment, but Meldrick and Mikey make things hard on themselves by losing the suspect on the way back.

Briscoe and Curtis clash with Pembleton and Bayliss, who have come to New York to investigate a subway explosion resembling an unsolved bombing in Baltimore from five years ago. The investigation soon leads to a larger conspiracy.