Three attempts on Russian General Trebass's his life have failed, but the Czar is determined to keep him alive. The Czar assigns the redoubtable, French detective reporter, Rouletabille to the case. It quickly becomes apparent that one of the General's own retinue is in league with the assassins...
A new tenseness seemed to have crept into the situation. The conversation, never without its emotional tendencies, at once changed its character. Philippa, cold and reserved, with a threat lurking all the time in her tone and manner, became its guiding spirit.
With the theft of the sacred slipper, worn by the great Prophet himself, came a wave of outrageous horror. The truth emerged behind these inhuman outrages was a secret group of fanatics--Assassins--trained from childhood to wreak havoc on all who dared disturb their sacred relics.