Gerald MacTeam, a Scottish aristocrat engaged to an American woman named Kitty, abruptly calls off their engagement and retreats to his ancestral castle in Scotland after learning of his uncle's mysterious death. Concerned and bewildered by his sudden change in behavior, Kitty decides to follow him to Scotland, accompanied by her aunt Miss Margaret Dillingholm. When they arrive at the foreboding castle, they are met with a cold reception and find that Gerald has undergone a puzzling transformation, becoming reclusive and secretive. Intrigued and alarmed, Kitty and her aunt begin to investigate the eerie grounds and Gothic architecture, particularly the high maze that seems to hold a sinister secret.

As they delve deeper, strange occurrences unfold within the castle's walls, and the women uncover an atmosphere thick with tension and fear. The cryptic behavior of servants, unusual nocturnal activities, and Gerald’s increasingly erratic actions hint at some dark hidden truth connected to the family legacy. Their quest for answers leads them deeper into the maze's labyrinthine structure, compelling Kitty to confront unimaginable horrors in her determination to uncover the terrible mysteries that have consumed her fiancé and the MacTeam lineage.