Rex Harrison plays a young Englishman who suffers periodic bouts of amnesia. When the plane he is riding in crashes, Harrison blacks out again and awakens in Paris. He is told that for the past ten days he has been involved in espionage of some sort or other--and now his life isn't worth two francs. Based on the novel The Disappearance of Roger Tremayne by Bruce Graeme, the seriocomic Ten Days in Paris served as the inspiration for a multitude of future reluctant-spy escapades.