THE WEIRDEST MISSING PERSONS CASE EVER

A 13-year-old girl disappears from her California home then seemingly resurfaces 22 years later

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Their childhoods were unstable. As their mother, Charlotte, navigated multiple marriages, affairs and a suicide attempt, siblings Mary Louise Day, Kathy Pires and Sherrie Calgaro spent time in foster care. Sherrie, the youngest, was ultimately adopted by another family while her half-sisters returned to their mom, who raised them with third husband William Houle, a soldier. But in the summer of 1981, 13-year-old Mary vanished from their Seaside, Calif., home without a trace.

Kathy and Sherrie were told their sister had run away; the family didn't speak about her. It never made sense to Sherrie, who as an adult contacted police and discovered her mom and stepdad had never reported Mary missing. For years, Sherrie had “a hole in my heart wondering what happened to her,” she said in The Girl who Died Twice, a new installment of Investigation Discovery’s The Curious Case of...