FOUR COUPLES. Summer 1979. In the idyllic suburban neighbourhood of Ridgefield, Australia, during a scorching heat wave, four couples gather for their weekly dinner party. AN ORDINARY EVENING. When Frank Callaghan checks on the sleeping children, he finds an empty crib where his four-month-old daughter Megan should be sleeping. The party-goers swear they didn’t see anything, but each of them has something to hide. THE BEGINNING OF A NIGHTMARE. Forty years later, a stranger knocks at the Callaghan’s door. She claims to be their missing daughter. And she's holding the blanket she was wrapped in the night she disappeared. Shocked, the Callaghans must finally confront how well they know their neighbours, and ask themselves: Where has Megan really been all this time?