An eminent lawyer Edward Leithen becomes close friends with Vermon Milburne through unusual circumstances of chance. Milburne divulges that since childhood he has had a recurring dream in which an impending and unknown threat approaches year by year. The year in which the threat is due to occur, the two friends find themselves on the Greek island of Plakos where they must save the beautiful Kore Arabin from the superstitious islanders.