Archibald Hunter was spending his annual vacation in Cruden Bay, Scotland when he sees two women and a man walking abreast. Suddenly, he has a vision of the man carrying a coffin and the two women walking behind.
As this was happening, Archie was being watched by an old woman, Gormala. According to Gormala, both he and she are Seers, and she proposes an alliance to solve the centuries-old Mystery of the Sea.
Archie discovers a chest full of old documents he believes contain a coded message revealing the location of a lost treasure of the Spanish Armada.