Stachel as a lower-class hero. Doctor von Klugermann, an aristocrat, recognises the unfair nature of Germany's class system and disapproves of it but makes no effort at change. Käti von Klugermann: Kaeti's character in the book and film are similar. The Gräfin comes from the lower classes but relishes her status and wealth. Both characters deftly use sexuality to get what they want. In the book, while she is drunk, Stachel extorts money from Käti with his knowledge of her affair with Willi. Later, she blackmails Stachel to marry her by threatening to reveal his murder of Willi and two British pilots. In the film, she proposes for Stachel to run away with her to Switzerland, which he refuses. For that slight, she exposes Stachel's lies. Her husband, the General, then sends Stachel to his death in an unstable aircraft to preserve the honour of the officer corps. Elfi Heidemann: In both the novel and the film, Elfi is a nurse stationed in Berlin. In the book, Elfi is an alcoholic who overcomes her addiction with the assistance of Doctor von Klugermann. Stachel recognises Elfi as his kindred spirit, and after Heidemann's death, seeks to form a relationship with her. Käti literally stops him at Elfi's door, which forces Stachel to marry her instead. Stachel ruefully accepts his fate to return to Käti and alcoholism. Corporal Rupp: Rupp has only a minor role in the movie. In the novel, he is an Unteroffizier and thoroughly distasteful character, and Stachel describes him as "a pig of a man". He earns extra money by smuggling cheap booze to Stachel and by using one of the squadron's reconnaissance cameras to take pornographic pictures for Kettering's extensive collection of erotica. In the end, it is Rupp who provides Kaeti with evidence that implicates Stachel in Willi's murder. Conclusion: In the movie, Heidemann flies the monoplane first and determines that it is a "death trap" because the struts are too weak for the wing loading. General von Klugermann then sends Stachel to his death to shield the German Officer Corps from the shame of Stachel's false claim of two victories. In the novel, it is Stachel who tries out the new monoplane, finds the defect and then allows Heidemann to fly the aircraft. Before Heidemann takes off, Stachel tries to stop him to save his life, but Heidemann continues and dies. Hunter's novel ends with