Morgan Hunter, while backpacking in Scotland, explores the ruins of an ancient castle. He finds refuge from the wind in an underground room, where there is a deep pool of water. He naps and wakes. And naps. And discovers he is not alone-there is an old man on the other side of the pool. This man waves one hand, and Morgan falls into the pool and surfaces in a tropical garden. There is another pool, and the old man once again appears, and this time...