Lester Gruber has been given the job of laundering Captain Binghamton's uniforms. When a Japanese sub fires on the PT 73, the uniforms are destroyed, and Lester's finger is scratched, prompting him to put in for a Purple Heart.

When a Japanese radio announcer broadcasts details about Captain Binghamton that only someone close to him would know, Binghamton immediately suspects McHale and The 73 Crew, and enlists Parker's aid in nailing the traitor.