Returning to Paris, Inspector Gautier is devastated to learn that his Dutch mistress Ingrid has been brutally murdered. Before he can begin to investigate, the British Ambassador informs Gautier that his daughter has been abducted in England. With the help of Sylvie, a secretary at the French Embassy, the inspector follows the trail to Edinburgh to track down the ambassador's daughter.
Back in Paris, influential people are being murdered, and the wife of the Minister for War is abducted. Out of these shocking events a political motive begins to emerge, and Gautier, with Sylvie's help, starts to unravel the conspiracies under the looming threat of war.