When a cache of 1,500 firearms are stolen, Cagney, who now works a desk job, & Lacey who has retired from the force, team up again to catch the robbers! The duo's cooled friendship isn't the only difficulty they must overcome as they find there was a mole who helped the crooks & the lead suspect is Marcus. Meanwhile, Mansfield is back & Cagney is convinced he is behind the theft!
