Dick Young stays in his friend Professor Magnus Lanes house in Cornwall on the understanding he will be a guinea-pig for a new drug that Magnus has developed. As a result of the experiment he is transported back to fourteenth century Cornwall. With each trip he becomes more & more involved with medieval intrigue adultery & murder. Is it merely hallucination; a subconscious escape from his own complicated life or a real journey into the past? He becomes obsessed with the world he visits & past & present eventually become inextricably & perilously mixed.