Patrick Galloway is a former soldier turned writer and an authority on occult phenomena. In 1922 he receives a plea for help from his old friend and former comrade in arms Jeremiah Covenant. It seems that something very strange and gruesome is happening at the Covenant estate. Believing his old friend to be exaggerating, Galloway travels to the Covenant estate in Ireland. He soon realizes that Jeremiah Covenant has not been exaggerating at all -- quite the opposite.