Frank Castle is a former Marine turned vigilante who dedicates himself to punishing criminals in New York City. After a mission goes wrong, his battle against crime leads him to a confrontation with a violent mafia boss, Billy Russo, who also has a dark past. In a brutal scene, Frank attempts to eliminate Russo's threat, but things take an unexpected turn when he inadvertently causes the death of an innocent, making him the target of an unrelenting revenge.
At the same time, the victim's family is irrevocably affected, and her daughter, being the sole survivor, forms an unexpected bond with Castle. The vigilante feels tormented by his actions and is reluctant to continue his mission, but the underworld of New York doesn't stop. With the help of an unconventional group of allies and his unyielding tenacity, Frank faces a series of adversaries determined to eliminate him, including a deranged killer named Jigsaw, who is ready to unleash chaos.
The story is filled with relentless action, graphic violence, and an exploration of morality in a world where the lines between good and evil blur. As Castle grapples with his own past, he wonders whether he can truly find redemption or if he is destined to be an angel of death in a city that never stops needing justice.