A thief uses extreme measures to heist an heirloom necklace from a wealthy businessman's penthouse. Stacy becomes concerned that Nick is being turned into a lab rat at the university where he has volunteered for a research study.

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.