A racketeer and his beautiful actress wife are among those concerned in a scheme to involve Simon in an ingenious blackmailing plot.
Following the assassination of the esteemed monarch of Sayeda, the corrupt usurper and the discoverer of an immense oil field are after the young Prince and the land's oil treasure.
Saint spots a nun wearing high-heeled shoes whilst collecting for charity at a London railway station, Simon's interest is aroused and he is soon plunged into an exciting cross-London chase to thwart the schemes of a clever gang of criminals.
Why should wealthy Lord Gillingham wish to purchase a copy of his fabulous family diamond necklace? Intrigued, the Saint attends a fashion show - and ends up preventing a robbery.
For revenge on Steed, an old enemy leaves him a deadly legacy in his Will: a jeweled oriental dagger worth a million dollars, the Falcon, which various dangerous men are anxious to acquire.
