After his wife is murdered by street punks, a pacifistic New York City architect becomes a one-man vigilante squad, prowling the streets for would-be muggers after dark.
On the eve of her 17th birthday, Mari and friend Phyllis set off from her family home to attend a rock concert in the city. Attempting to score some drugs on the way, the pair run afoul of a group of vicious crooks, headed up by the sadistic Krug.
Cookie Voltecki is the illegitimate daughter of mobster Dino Capisco, who has just finished thirteen years in prison. Since being released from jail, all that Dino wants is to settle some old scores, and make up for lost time with his daughter.
Millions in diamonds are stolen from a New York City safe, and later the burglar is killed. Shamus is paid $10,000 by the owner to find the diamonds or the killer.