On New Year's Eve, Rhys Lloyd has a house full of guests. He's celebrating the success of his lakeside holiday homes, and has generously invited the village to drink champagne with their wealthy new neighbours. By midnight, Rhys will be floating dead in the freezing waters of the lake. On New Year's Day, DC Ffion Morgan has a village full of suspects. She grew up in the tiny community, so the murder suspects are her neighbours, friends and family - and Ffion has her own secrets to protect.