Iris Grey arrives at Pitfeldy Castle in the Highlands, at the request of the Baron, Jock MacKinnon. Jock has commissioned Iris to paint a portrait of his fiance, an American socialite Kathy Miller, ahead of their New Year wedding.

Kathy invites Iris into her confidence, she's received a series of threatening notes asking her to call off the wedding. Iris begins to investigate, and when remains are discovered in the grounds of the Castle, she fears for Kathy's safety.

With the wedding fast approaching, Iris once again enters a world of family feuds, romantic intrigue, buried secrets and murder.