July 1969, and mankind is on the Moon. Both the United States and Soviet Russia have lunar bases, and both are in trouble.

Back on Earth, Anne Travers has learned she is about to be visited by an old friend from America, Doctor Patricia Richards. Lance Corporal Bill Bishop is aware of the visit, and is on hand to meet Richards. She brings with her a surprise, one which the Americans and Russians wish to get their hands on. But the only man who can truly help Anne, Colonel Lethbridge-Stewart, is away in Scotland.

It's a game of cat and mouse, as Anne and Bishop seek to protect the life of an innocent baby – one that holds the secrets to life on the Moon.The first book in the second series of Lethbridge-Stewart novels. A series of novels from the classic era of Doctor Who, starring Anne Travers and Colonel Lethbridge-Stewart, based on the characters and concepts created by Mervyn Haisman and Henry Lincoln.