Tiger Mann is faced with one of the most frightening challenges of his career: to avert the imminent destruction of the defence system of the United States. An engineer has disappeared, taking with him the secret of the device he created: a method to by-pass the buttons which activate America's most deadly missiles - and render the system inoperative.

The Communists want more than anything else to discover the workings of the by-pass control, and Tiger is equally determined to see that they don't. But to prevent them, Tiger has to find the missing man first ...

And that's a job in itself.