In the grim shadows of post-World War I San Francisco, a young boy named Blizzard becomes the victim of a botched surgical operation, leaving him mutilated and fostering a deep-seated bitterness toward the world. As years pass, Blizzard rises to become the ruthless leader of an underworld anarchist group, seeking to manipulate and control the city's criminal circuits. His reign of terror is marked by a well-crafted facade of charm and intellect, which he uses to both intimidate his adversaries and entice followers. Hidden behind his benevolent exterior, Blizzard plots a grand scheme of revenge aimed at the surgeon responsible for his condition.

Amid Blizzard's vicious plans, an undercover police officer named Rose enters his lair, posing as an artist to gather evidence. As she gains Blizzard's trust, she becomes entangled in his world of violence and hatred, but slowly begins to unravel the humanity buried beneath his vengeful exterior. Rose faces moral dilemmas as she balances maintaining her cover and preventing Blizzard's catastrophic plans. Meanwhile, the surgeon who wronged Blizzard, now leading a quiet life, is drawn back into the chaos as Blizzard's machinations edge closer to fruition, setting the stage for a tense and explosive confrontation.