During excavation work at a building site in Hobbs Lane, London, workmen discover a skull and other fossilised bones. But are they really remains from a five million-year-old skeleton as claimed by Dr Roney, or something altogether more sinister? Meanwhile, Professor Quatermass, head of The Rocket Group, is resisting government plans to install missiles on the Moon, in a menacing project known as the Dead Man's Deterrent.