Traitors’ Gate by Dennis Wheatley (Vintage 1973 Illustrated Hardcover)

Traitors’ Gate is the seventh in Dennis Wheatley’s bestselling Gregory Sallust series featuring the debonair spy Gregory Sallust, a forerunner to Ian Fleming’s James Bond.

In the summer of 1942, Hungary was not yet embroiled in the war so when secret agent Gregory Sallust is sent to Budapest on a mission, he is able to live once more in a pre-war atmosphere of love and laughter.

But wars of the heart know no rules, so when his mission gets him involved with von Ribbentrop’s beautiful Hungarian mistress, the laughter is silenced by fear as he desperately struggles to save them both in this complex and action packed adventure.