Marina Pinares, the wife of the president of a South American country, insists on being his vice-presidential running mate in the next election. She's no stranger to assassination to get what she wants, so some suspect she'll kill her own husband after the election to become president. In a series of flashbacks we see her rise to power: a party girl willing to sacrifice a friend's virtue to gain favor; the lover of a soldier she later tortures; the mistress of the military man she soon marries.

B 501, a newly developed controller for missiles, has disappeared despite the strict surveillance. Phillippe Tissout is sent by his boss to Paris to take over the case.

Set in German-occupied Norway, resistance fighter Knut Straud enlists the reluctant physicist Rolf Pedersen in an effort to destroy the German heavy water production plant in rural Telemark.

The outbreak of World War I places Scots officer Geoffrey Richter-Douglas in an uncomfortable position. Although his allegiance is to Britain, his mother was from an aristocratic Bavarian family, and he spent his summers in Germany as a child. When Geoffrey is approached by a German spy who offers him a chance to defect, he reports the incident to his superiors, but instead of arresting the spy they suggest that he accept her offer--and become an Allied agent. In Germany, among old friends, Geoffrey discovers that loyalty is more complicated than he expected, especially when he finds himself aboard the maiden voyage of a powerful new prototype Zeppelin, headed for Scotland on a secret mission that could decide the outcome of the war.