“I’m rotten to the heart,” Phyllis Dietrichson (Barbara Stanwyck) confesses with breathless bitterness in Billy Wilder’s classic 1944 noir, “Double ... jiggling anklet and her plan ...

The seductive blonde only has to flash her ankle bracelet to turn Neff from decent guy into cold-blooded killer focused on the payout of the double indemnity clause on Dietrich’s accident policy.