The Eye of Callanish is set at the beginning of the twelfth century on the Island of Lewis in the Outer Hebrides, off the west coast of Scotland. It tells the story of a young girl, Mairi, who is persecuted for being in league with the Devil. She believes that she is able to communicate with the ancient people who built the temple of Tall Stones at Callanish. Mairi is aided in her escape from her persecutors by Neil and the hermit Brother Durston, who we first met in Weapons of the Wolfhound. On the way they face many dangers and frightening situations. But just who are these ancient people that Mairi is communicating with? Where did the beautiful white horse appear from? And whose is the dead body in the cleft? Neil is fascinated by the search for Truth ... and at the same time terrified of it...