It's World War II and Charlotte has been trained to be an undercover courier for England. She straps on a parachute and falls from the sky into Vichy France. There she will assist the French Resistance in its defiance of Nazi occupation. Once behind enemy lines, she keeps secret her personal mission to find her lover, an RAF pilot downed over France.

When the world's media descend on the remote Scottish Island where a Hollywood actress is attempting to get married, a local girl is hired as a decoy bride to put the paparazzi off the scent.