Sax Rohmer 
Quest of the Sacred Slipper 

This juicy tale from Sax Rohmer, the British author who introduced the criminal genius Dr. Fu Manchu to the world, follows an elite group of Muslim assassins who are given the mission of exacting vengeance on those responsible for absconding with one of Islam’s most holy relics — an intricately decorated slipper purported to have belonged to Muhammad himself.