The St-Cyr and Kohler mysteries by J. Robert Janes feature an unconventional detective duo working in a tense and dangerous environment: a chief inspector from the French Sûreté Nationale and a German detective inspector serving in the Gestapo, both investigating crimes in Nazi-occupied France in 1942 and 1943. Surrounded by threats from the French resistance, as well as the ever-present eyes of the SS, Gestapo, SD, and German military, they must navigate a complex web of dangers arising from the power struggles between competing Nazi factions vying for control of the occupied country. Their investigations uncover crimes whose backgrounds and broader implications risk upsetting the fragile power dynamics in occupied France.