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Fresh from a two-year stint in a mental institution for the alleged "mercy killing" of his ailing wife, Stephen Neale (Ray Milland) visits a carnival where he wins a cake by guessing its weight. The cake, however, contains a microfilm sought after by Nazi spies, and Stephen soon finds himself a target. On the run and unsure of whom to trust, he enlists the help of a private detective (Erskine Sanford), a beautiful woman (Marjorie Reynolds) and an inspector from Scotland Yard (Percy Waram). Wikipedia