Originally titled The Black Market, one of two stories originally published in The Saint On Guard. This edition contains only the one story.
Cover art by Victor Kalin.
128 pages. 25-cent cover price.
For some reason, the two stories within The Saint on Guard were often published separately. The 1958 Avon edition contains one and another Avon release, 1956's The Saint and the Sizzling Saboteur was the other (q.v. for a 1980s reprint of the latter).