ABC 20/20 on Instagram: "A California couple and their two young sons mysteriously vanished without a trace. Family and friends were left puzzled as investigators searched the home and found food sitting out, clothes scattered across the rooms, and the beloved family dogs left abandoned outside. #ABC2020's all-new episode “What Happened to the McStays?” premieres Friday (Oct. 3) at 9/8c on @ABC. Stream the next day on @DisneyPlus and @Hulu."