Moriarty is Sherlock Holmes told from the villain's perspective, except the villain is right. The show takes that premise and actually commits to it, turning every elegant scheme into a argument about whether systematic evil deserves systematic destruction. You watch Moriarty outthink Holmes not because he's smarter, but because Holmes is defending a rotting system, and by the end you're not sure who the real criminal is anymore.
Victorian London operates as a machine designed to crush anyone without a title. The wealthy hoard power while the poor rot in poverty, invisible to a system built to protect the privileged. William James Moriarty, a brilliant mathematics professor with aristocratic blood, grows sick of watching injustice go unchallenged. He begins constructing an elaborate web of crimes targeting the corrupt nobility, each carefully orchestrated to expose the rot at the empire's foundation. But Moriarty isn't a common criminal driven by greed. He's engineering a complete societal collapse, betting that destruction is the only path to rebuilding something just. Standing opposed is Sherlock Holmes, the consulting detective whose reputation for solving impossible cases makes him the empire's unexpected guardian. As Moriarty's plans unfold across London, Holmes inches closer to understanding the architect behind the chaos. What emerges is a psychological duel between two brilliant minds operating from opposite moral certainties: one convinced that crime can create revolution, the other convinced that order depends on shutting him down. Neither can afford to lose.