The Foreign Office ably assisted in the roundup of an espionage ring in 1938 by Warnford, ex-soldier cum scandal, and Marden, a gentleman burgler. Due to their pasts, they remain incognito, but right-hand all efforts being made by Tommy Hambledon in tracing leaks on British International (particularly Russian) policies, provide and meet violent action, and with a mad climax in a mental home, fight side by side with Hambiedon and land in the clear. Prescription as before.