Reich Special Investigator Ernst Schöller attempts to secure his survival by defecting to the Allies during the final, chaotic days of the Third Reich. Schöller, possessing intimate knowledge of Nazi leadership, initiates a high-stakes negotiation with Allen Welsh Dulles of the O.S.S. in Switzerland. To ensure his cooperation, the inexperienced American clerk Elliott is assigned to monitor him, despite lacking any formal field training. The narrative follows their uneasy partnership as they navigate the moral decay and tactical desperation of a collapsing regime, forcing Elliott to rapidly adapt to the lethal requirements of espionage.

Readers frequently highlight the book's commitment to historical accuracy, noting that the author blends factual events with fictionalized character arcs to create a grounded atmosphere. Discussion often centers on the psychological transformation of the protagonist, Elliott, as he sheds his innocence in the face of wartime atrocities. Critics often point to the stark, clinical prose style that mirrors the cold calculations of the intelligence world. The novel is noted for its avoidance of traditional heroics, focusing instead on the pragmatic and often grim realities of survival. Many readers appreciate the nuanced portrayal of the power dynamics between the defector and his handler.