In the end, Valérie Bacot could take it no longer. For almost four decades, her husband, Daniel Polette, had been a malign presence that dominated her life: he molested her when she was 12, made her pregnant at 17 and then trapped her in an abusive relationship, during which she bore him three more children.

Now in the ultimate humiliation, he was pimping her out for sex in the back of their battered Peugeot people-carrier in the woods near their home in Saône-et-Loire, in central France, getting his kicks from watching through a chink in the curtain in its rear window.

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