CS Foyle and Sgt. Milner investigate what they believe is a black market operation in the docks area. They set up a dummy company, with Milner at the head, to see what they might find and soon enough, they are approached by someone working at Talbot's shipyard. By chance, the station desk sergeant's daughter works at Talbot's and has important information for Foyle. When her boyfriend, a sapper with the Royal Engineers, is called out to Talbot's to disarm an unexploded bomb, he and his mates find something else that leads to one of them being murdered. Throughout all of this, Foyle is hounded by Assistant Commissioner Rose who insists that Foyle drop everything and investigate the activities of Raymond Carter a so-called communist agitator who is staying in Hastings.

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