The third novel in the science-fiction trilogy by C.S. Lewis. This final story is set on Earth & tells of a terrifying conspiracy against humanity. The story surrounds Mark & Jane Studdock a newly married couple. Mark is a Sociologist who is enticed to join an organisation called N.I.C.E. which aims to control all human life. His wife meanwhile has bizarre prophetic dreams about a decapitated scientist Alcasan. As Mark is drawn inextricably into the sinister organisation he discovers the truth of his wifes dreams when he meets the literal head of Alcasan which is being kept alive by infusions of blood. Jane seeks help concerning her dreams at a community called St Annes where she meets their leader
- Dr Ransom (the main character of the previous two titles in the trilogy). The story ends in a final spectacular scene at the N.I.C.E. headquarters where Merlin appears to confront the powers of Hell.