Hotel Reserve

In 1938, refugee Peter Vadassy (James Mason) decides to take a vacation at the Hotel Reserve to celebrate both his completion of medical school and his impending French citizenship. When he goes to pick up some photographs at the local pharmacy, he is taken away and questioned by Michel Beghin (Julien Mitchell) of French naval intelligence. When his negatives had been developed, some of them turned out to be of French military installations. It is discovered that while the camera is the same make as Peter's, the serial number is different. Peter is released on condition that he find out which other hotel guests have cameras like his.