When plans for Jean Aubry's revolutionary "combat aircraft" are stolen by a German spy, his daughter Germaine volunteers to bring them back. Disguised as a governess, Germaine infiltrates the highest levels of the German military. When she is finally unmasked and imprisoned, her father and her aviator fiancé call on the ultimate secret agent to help bring her home. Chantecoq. King of detectives, master of disguise. But even the mercurial, theatrical Chantecoq will find his ingenuity stretched to the very limits to rescue Germaine Aubry from Spandau Citadel. Originally published as Coeur de Française, and translated into English for the first time, this first Chantecoq adventure is a bold pulp tale of honour, patriotism, romance, and selfless heroism. Filled with suspense, fast cars, swordfights and daring escapes, the action unfolds against a backdrop of growing hostility between France and Germany.