Paris, Kingdom of France, August 18, 1572. To avoid the outbreak of a religious war, the Catholic princess Marguerite de Valois, sister of the feeble King Charles IX, marries the Huguenot King Henry III of Navarre.
An ornithologist mistaken for an explosives expert is sent alone into a small French town during WWI to investigate a garbled report from the resistance about a bomb which the departing Germans have set to blow up a weapons cache.