John, Elizabeth, Stephen and Mike find themselves facing a deadly attack, the origins of which stretch back decades and reach out beyond Earth.

John is fascinated by a forthcoming exhibition about human evolution at a major London museum, where Professor Marchwood seems to know more than he should. How has Marchwood gone from a derided joke in the scientific community to a genius in such a short time? And why is he so interested in telepaths?

Investigating these questions puts the Tomorrow People in danger and sends them across the planet to the roof of the world where terrors and surprises lie in wait for them…