Portrait artist Iris Grey arrives at Baron Jock MacKinnon's castle in the Scottish Highlands to paint a portrait of his fiancée, socialite Kathy Miller, ahead of their New Year's nuptials. In this sequel to Murder at the Mill, Kathy has received a series of threatening notes demanding she call off the wedding. Iris begins to investigate, but when a body is discovered in the grounds of the castle, she's caught up in a world of family feuds, romantic intrigue, and murder.