Innumerable explanations have been put forward for the phenomena, known popularly as U.F.O'S and Flying Saucers. Eminent psychologists explain them as purely mental phantasmagoria - symptomatic of mankind's age-old desire for "saviours from the sky".
Enthusiastic arm-chair cosmonauts regard them as irrefutable proof that super intelligences from Out There are watching the Earth. A few un-scrupulous publicity seekers and practical jokers cash in on the public's curiosity and weird stories of little green men and pink ants go the rounds.
Amateur military tacticians decide that the saucers are either out new secret weapons or the experimental weapons of some alien power.
Interest rises and falls. The Great Debate continues.
There are some other possibilities . . . and the implications of some are so horrifying that mere monsters from Beyond would be a pleasant anti-climax. This mature, challenging novel is not recommended for those who like to think of the everyday world in terms of permanence and security with humanity safely established at the head of creation.
Elspeth Jermyn came dangerously close to the truth, and slowly but surely gathered a small group of helpers together. They worked in strictest secrecy against the Saucer Phenomena and the invidious menace behind it . . . if they failed, life would have no real meaning.