It was almost unbelievable: Napoleon Solo, U.N.C.L.E.'s top enforcement officer, had been captured on the doorstep of U.N.C.L.E. Headquarters, and carried away helpless before his fellow agents could act.

There were no clues to tell who had been behind the kidnapping; there was no trail to follow to rescue him. Yet Ilya Kuryakin and the rest of U.N.C.L.E. had to try.

Meanwhile, Napoleon awoke in a strange fortress and discovered why he had been captured - and knew the security of the world depended on his escape...