Iris Grey rents a quaint cottage in a picture-perfect Hampshire village, looking to escape from her crumbling marriage. She is drawn to the neighboring 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 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?

The first in a new crime series from M. B. Shaw, pen name of best-selling author Tilly Bagshawe. Murder at the Mill introduces listeners to portrait painter and amateur sleuth Iris Grey, who sees the truths of others while struggling to find her own way. Grey arrives at The Mill in Hampshire, commissioned to paint a portrait of Dominic Wetherby, a celebrated author. She quickly finds herself drawn into a world of village gossip, romantic intrigue, buried secrets and murder.

Portrait painter Iris Grey arrives at Pitfeldy Castle in the Scottish Highlands, at the request of Baron Jock MacKinnon. Jock has commissioned Iris to paint a portrait of his fiancee, American socialite Kathy Miller, ahead of their New Year wedding. Kathy invites Iris into her confidence, as she's received a series of threatening notes asking her to call off the wedding. Iris begins to investigate, and when a body is discovered in the grounds of the castle, she fears for Kathy's safety.