Following a sanguinary affray on the outskirts of London Sir Leonard Wallace, the famous chief of the Secret Service, found evidence of an anarchist organization headed by a man called Ulyanov, who had sworn to exterminate all royalty. Carter, Wallace's astute colleague, joined the anarchists to discover where next they would strike and the secrets of their stronghold. Success seemed assured, but suddenly the tables were turned. Wallace, with his band of courageous adherents found themselves at bay, trapped by desperate fanatics.