In an effort to save their marriages, Stockholm-based Carl and Helene arrange a holiday-house swap with Adam and Scarlett, who live in Sicily. But upon arriving at their new exclusive home, Carl and Helene start to sense that something feels off. The house doesn't quite match the pictures of the romantic villa, and unsettling questions arise about the strangers now living in their home. Who are these people they've traded homes with? Meanwhile, Adam and Scarlett move into Carl and Helene's house in Stockholm’s archipelago, a stunning, modern architectural dream. But despite its beauty, things feel awkward. Why are the neighbours so nosy? Why is the walk-in closet locked? As both couples try to reconnect amidst growing suspicions, dark secrets begin to surface.