A group of English cruise-ship tourists debark to visit the isle of Crete's famed labyrinth, the City in the Rock. The motley gathering includes a painter, a poet, a soldier, an elderly married couple, a medium, a convalescent girl, and the mysterious Lord Gracean. The group is prepared for a trifling day of sightseeing and maybe even a glimpse of the legendary Minotaur, but instead is suddenly stuck in a nightmare when a rockslide traps them deep within the labyrinth. Who among the passengers will make it out alive? And for those who emerge, will anything ever be the same?