In the third novel in C.S. Lewis's remarkable science fiction trilogy, newly-married Mark and Jane Studdock are drawn into events very far out of the ordinary. The morning after a horrific nightmare about a decapitated head, Jane sees the same face in a newspaper and has the growing feeling that she is being warned of something real and ominous. Meanwhile, Mark has been enticed to join the National Institute for Co-ordinated Experiments, which aims to control human society. As he is drawn into the sinister organization, he discovers the truth about his wife's dreams, while she seeks helps at a community called St Anne's, led by the charismatic Dr Ransom...