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Two-timing his girlfriend, Kitty (Moira Lister), con man Mark Bellis (Ray Milland) woos naive widow Olivia Harwood (Ann Todd), luring her into his latest criminal scheme. As directed by Mark, Olivia begins stealing from her employer, Susan Courtney (Geraldine Fitzgerald). Soon, Mark is after more loot from the Courtney household, and Olivia reluctantly agrees to blackmail Susan. But the plan isn't foolproof, and, when Olivia realizes Mark has another lover, things get even dicier. Wikipedia