Nash has to deal with the fact that Joe may have 72 hours to live after being exposed to a deadly virus while Nash & Joe investigate a drug theft from a research lab.

Nash and Joe help FBI Special Agent Katz recover a Suburban full of stolen FBI weapons. Joes sets Nash up on a blind date with his nanny.

Nash and Joe are on the trail of a renowned assassin who has come to San Francisco to kill FBI special agent David Katz. Lisa Bridges returns from Paris and announces she's engaged to marry a famous French chef named Henri, but there's a problem; Nash and Lisa's divorce was never finalized--they're still married. The new S.I.U. is introduced.