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When 23-year-old mother of four Stacy Peterson disappears without a trace in Illinois, her husband, a police officer named Drew Peterson, claims she ran away with another man. Authorities scour the state, but turn up little evidence of her whereabouts. As they dig into the Petersons' lives, they discover a shocking coincidence - just a few years earlier, Drew's previous wife, Kathleen Savio, died under mysterious circumstances. The death was initially ruled an accident... but investigators begin to suspect she was murdered.

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