[3] Detective Chief Superintendent Christopher Foyle (Michael Kitchen), a widower, is quiet, methodical, sagacious, scrupulously honest and frequently underestimated by his foes.

Many of his cases concern profiteering, the black market and murder, and he is often called on to catch criminals who are taking advantage of the confusion created by the war.

Although Foyle often comes up against high-ranking officials in the British military or intelligence services who would prefer that he mind his own business, he seeks justice tenaciously.

Throughout the series, he is assisted by his driver, Samantha "Sam" Stewart (Honeysuckle Weeks), and Detective Sergeant Paul Milner (Anthony Howell).

[8] When the audience figures for the final episode were released (28 percent and an average of 7.3 million viewers), ITV confirmed that it had entered "early discussions" with Horowitz and Greenlit.

[12] Even after this second cancellation, Horowitz continued to hold out hope for some sort of revival, spin-off around Honeysuckle Weeks's character, or even just some Christmas specials.

[13] An example of the later concept was even developed by Horowitz as Foyle's Last Case, an exclusive two-part Christmas short story for The Daily Mail newspaper, published there on the 22 and 23 December 2018.

[14] 1 (1) "The German Woman" 2 (2) "The White Feather" 3 (3) "A Lesson in Murder" 4 (4) "Eagle Day" 1 (5) "Fifty Ships" 2 (6) "Among the Few" 3 (7) "War Games" 4 (8) "The Funk Hole" 1 (9) "The French Drop" 2 (10) "Enemy Fire" 3 (11) "They Fought in the Fields" 4 (12) "A War of Nerves" Anthony Horowitz Anthony Horowitz 1 (17) "Plan of Attack" 2 (18) "Broken Souls" 3 (19) "All Clear" 1 (20) "The Russian House" 2 (21) "Killing Time" 3 (22) "The Hide" 1 (23) "The Eternity Ring"2 (24) "The Cage" 3 (25) "Sunflower" 1 (26) "High Castle"2 (27) "Trespass" 3 (28) "Elise" Episode numbers in parentheses are a running count used in the following table, "Main Characters".

Notable authors on the town during this period and who are acknowledged in these books as offering further information are Nathan Dylan Goodwin, Victoria Seymour and Mary Haskell Porter.