Simon has arranged to send a rare mummy of a pharaoh from Cairo to Phildelphia to his good friend, Keystone University archeology professor Horatio Bitts, whose beautiful daughter does not escape The Saint's attention. Ruthless gang leader Duke Bates, known as "The Boss," is a dead ringer for Simon and a notorious jewel smuggler who uses the mummy to disguise a cache of illegal diamonds. After Bates murders a shady jewel cutter and the professor, Simon finds himself under suspicion... even by his old friend, Inspector Fernack.