A small inheritance and a letter from his grandfather mark the beginnings of a journey that leads Peter Angus Gillies from Canada to the land of his forebears on the spectacular west coast of Scotland.

As Peter Angus explores the long-abandoned places where his ancestors eked out a living and listens to stories about them, he learns of treasure lost centuries before. With the help of a local girl, Sarah, he embarks on a search that will test him to the limit both emotionally and physically, and experience a love that will transform his life.

The Secret of Ardnish is the fourth part of Angus MacDonald's acclaimed series following the lives and loves of the Gillies family.