Joseph and Summer McStay seemed to be living the suburban American dream, raising their two young boys in their California home. Then, all four vanished without a trace, and the mystery only deepened. Inside the house, investigators discovered the family's beloved dogs unattended outside, rotting food on the kitchen counter, and clothes strewn across the floor. Days later, the case drew international attention when the family's car was found abandoned near the Mexican border. Stream the latest 20/20 ‘What Happened to the McStays’ full episode on Disney+ and Hulu under Season 48, Episode 02.

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