International terrorists attempt to kidnap a wealthy couple's child. Their plan comes unstuck, however, when a deadly Black Mamba, sent by mistake instead of a harmless snake, escapes and terrorizes both them and their hostages.

A deep-sea salvage expert enacts an elaborate plan to infiltrate and take revenge on a criminal organization that dealt him a foul misdeed.

After a flight back home, Sam Hendrix returns with a doll he innocently acquired along the way. As it turns out, the doll is actually stuffed with heroin, and a group of criminals led by the ruthless Roat has followed Hendrix back to his place to retrieve it. When Hendrix leaves for business, the crooks make their move -- and find his blind wife, Susy, alone in the apartment. Soon, a life-threatening game begins between Susy and the thugs.