It is 1937; Winston Churchill is receiving unauthorized information on Britain's rearmament program, and Lord Edward Corinth is brought in by the Foreign Office to investigate the leaks. Edward rapidly falls under Churchill's spell and quickly abandons his investigation to concentrate instead on finding the murderer of a Foreign Office official who may have been one of Churchill's sources.

He soon finds himself trying to untangle a web of deception that threatens the security of the state. There is a second murder within the Foreign Office, and Edward sets out for Spain to find the murdered man's son, though his real objective is to satisfy the gnawing fear that his friend Verity Browne, also in Spain, is in extreme peril.