A clash between rival drug lords uncovers new evidence on the whereabouts of Nash's missing brother, presumed killed in the Vietnam War. With Joe on vacation, Nash must rely on the rest of the team for help. While Lisa is away, her sister stays to watch Cassidy, causing some disagreements with Nash.

A shady woman who shares a past with Nash is the key to finding stolen weapon-grade plutonium; Joe wants to market his salsa.