Trapeze by Simon Mawer

Recruited from a quiet life into Britain’s clandestine war effort, a bilingual young woman undergoes intense training and is parachuted into Nazi-occupied France to serve the Resistance and persuade a brilliant physicist from her past to defect. As she navigates cutouts, safe houses, and coded messages, she confronts betrayal, fear, and moral ambiguity, torn between duty and desire while the ever-present threat of capture hangs over every decision.

Purchase from Bookshop.org