London: Collins, 1961

8vo, pp. 256. Original blue boards, lettered in gilt to spine. Illustrated dust jacket. Light tanning to leading edge of text block, otherwise a fine copy in a fine dust jacket but for a single unobtrusive closed tear to top edge at spine.

First edition of the first of two spy novels MacLean published under the pseudonym 'Ian Stuart' (the other was The Satan Bug (Collins, 1962)), to distinguish them from his usual high-octane adventure output.