Synopsis: "When Simon was living in Africa he had been very ill and had had a vision of a big man stretching out his arms towards him. A native doctor had told him that the illness was caused by the man in the vision, an ancestral spirit who as trying to make contact with him. This spirit, said the African, was Simon's 'Big Mister' and one day he would come again and show him many things. "Now Simon was back in England, living in a grimy industrial town with his cousin Anne and her family, but his thoughts kept returning to the native doctor's prophecy. One day, when he and Anne were exploring an old and derelict part of town, the prophecy began to come true in a bizarre and frightening way. Suddenly they were sucked backwards through time..." (Source: inside jacket blurb)