In a luxury villa set high in the hills above the glamorous town of Sorrento, southern Italy, three couples gather for the perfect 40th birthday celebration. Before the week is out, one of them is dead. Their perfect reunion quickly becomes the holiday from hell when one of the group starts receiving anonymous messages, threatening to expose a dark secret from their university days. As old friendships are tested to the limit, it's clear that what happens in the dark past won't stay buried. . .