<div>A young French au pair came to London chasing language lessons and adventure—then vanished into the twisted paranoia of the couple who employed her. When neighbors saw black smoke rising from a garden, firefighters uncovered a horror so bizarre it defied belief. This episode unravels how a shared delusion, jealousy, and control turned a home into a torture chamber, exposing the dark psychology behind <em>folie à deux</em> and the cracks in the system that failed Sophie Lionnet. </div>
