Having received intelligence regarding a dangerous band of anarchists
planning to assassinate King Peter of Yugoslavia on his royal visit to
England, the British Secret Service are hot on the trail of one of the
key suspects. At the centre of the investigation is Sir Leonard Wallace,
the famous Chief of the Secret Service. His team soon discover that the
group is a small part of a much larger conspiracy with international
ambitions of exterminating all royalty. Can Sir Leonard and his
courageous adherents disband the fanatics before their evil designs take
hold?