The Executioner Weeps by Frédéric Dard

A solitary man rescues an amnesiac woman after an accident and, as he nurses her back to health, becomes dangerously obsessed. As fragments of her identity resurface, shadows from her past close in, pulling them into a web of fear, jealousy, and crime. What begins as a tender attempt at salvation spirals into a fatal tangle of passion and betrayal, culminating in a bleak reckoning neither can escape.

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