Iris Grey arrives at Mill Cottage in a picture-perfect Hampshire village, looking to escape from her crumbling marriage. She is drawn to the neighbouring Wetherby family, and is commissioned to paint a portrait of Dominic Wetherby, a celebrated crime writer. At the Wetherby's Christmas Eve party, the mulled wine is in full flow - but so too are tensions and rivalries among the guests. On Christmas Day, the youngest member of the Wetherby family, Lorcan, finds a body in the water. A tragic accident? Or a deadly crime? With the snow falling, Iris enters a world of village gossip, romantic intrigue, buried secrets and murder.