Stewart has been removed as a police driver by Foyle's replacement, Meredith, and has been working as a librarian in the Air Ministry's cartography facility at Beverley Lodge for the last six months.
In addition, her uncle Aubrey Stewart (Brian Poyser), a country vicar, returns from the episode "The French Drop", when he visits Hastings for the ecumenical conference.
Milner, unhappy since Foyle's departure, seeks the latter's counsel after finding Meredith difficult to work with and considers leaving Hastings.
The episode mentions increased troop movements down to the south coast and that "the end of the war is in sight", indicating a pre-D Day setting.
Anthony Horowitz based much of the story on the experiences of Victor Gregory, a cartographer at Hughenden, who was engaged as a consultant during the shooting of the episode.
Tommy Crooks, a 15-year-old missing former child-evacuee, arrives to stay with Sir John and Lady Muriel Sackville, the gentry who had lived in the newly converted hospital and whose son was killed in the 1942 raid on Dieppe.
As a telegram boy, Crooks was traumatised by the reactions of those to whom he delivered bad news and also the recent death of his mother in a V-1 flying bomb attack.
Also, Brooke discusses a staff football betting pool at the station, in which they win £100, which Foyle suggests donating to Jewish refugees.