Burglar Nat Harbin (Dan Duryea) and his two associates set their sights on wealthy spiritualist Sister Sarah, who has inherited a fortune — including a renowned emerald necklace — from a Philadelphia financier. Using Nat’s female ward, Gladden (Jayne Mansfield), to pose as an admirer and case the mansion where the woman lives, they set up a perfect break-in. Things get complicated afterwards.
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