The episode marks the transfer of Station Sergeant Ian Brooke to Hastings from Deptford in London, and also the arrival of Captain John Keiffer and his 215th Engineer Battalion (Aviation) to begin construction of a US Army Air Force airfield nearby.
Foyle is befriended by Keiffer, an engineer from Northbridge, Massachusetts, in a relationship that deepens since the two share a common interest in fly-fishing.
Keiffer also mentions the loss of his younger brother, who was serving on the destroyer USS Reuben James when it was sunk in October 1941.
Mention is made by Leonard Cartwright of Convoy PQ 17 and of the sinking of the Christopher Newport and Navarino, which happened on 4–5 July 1942.
Stewart and Brooke spend the episode lobbying Foyle for the chance to eat a confiscated turkey before it spoils.
The episode again touches upon the theme of immunity from justice despite the war that aims to champion such noble ideals as British law and order.
Much of the episode's historical content was inspired by the invention of the bouncing bomb and the Dambusters raid of 1943, as portrayed in the film The Dam Busters.