A criminal mastermind who purchases a stolen government document from Eduardo Gambetti. He tracks the item to an opera house, confronts Sigerson Holmes backstage in a sword fight, and ultimately falls into the water after being tricked by a fake document revealing a tic-tac-toe game.
Gambetti and Moriarty form a transactional alliance to profit from the stolen document.
Moriarty and Sigerson are direct adversaries engaged in a life-or-death physical confrontation.