Michael's ex-fiancé seeks the spy's help in freeing her son, who was kidnapped by a disillusioned ex-spy named Brennen.

Arms trader Brennen returns and kidnaps Nate, forcing Michael to help him pull off an elaborate heist. Michael must also contend with Paxson's ongoing investigation.

Sam tries to help a friend who's been deemed a dirty cop clear his name. Elsewhere, Michael plans to meet with Jesse's former handler in order to make sure government documents end up in the right hands.

Michael's enemy Brennen and Michael's former friend Larry team up to pressure Michael into killing the individuals on the stolen NOC list. Meanwhile, Sam, Jesse, and Fiona try to help Michael turn the tables on Brennen and Larry.