The film follows a group of four sociopathic, homicidal children who, accompanied by a mysterious nun, seek refuge with a number of snobbish vacationers at a lakeside chalet, only to systematically murder them one by one.

Meanwhile, in Los Angeles, Julie and her boyfriend Rick embark to Lake Arrowhead to visit her father, Papa Doc, a real estate tycoon, at his lakeside chalet.

He subsequently discovers that Papa Doc's car has been tampered with and that the guns and knives in the house have gone missing; he fears the children are out to do them harm.

Sister Hannah drowns Lovely in a bathtub, while Moe sets Papa Doc's pet piranhas loose in the bathwater to devour her.

When Papa Doc witnesses the children dragging Lovely's body through the snow, he chases after them to Ralph's cabin, where he is killed with a knife in another rigged booby trap.

Rick and Julie flee, attempting to escape on a boat, but David forces them back to the chalet at gunpoint and the two barricade themselves in a second floor bedroom.

In the morning, David uses a ladder to reach the bedroom window and impales Julie through the neck with a pole that he forces through the glass, killing her.

[8] In 1976, Seymour Borde & Associates purchased international distribution rights to the film, re-releasing it under the alternate title Devil Times Five.

Cavett Binion of AllMovie described the film as "a seldom-seen but thoroughly satisfying horror sleeper with a sardonic sense of morality, taking great delight in knocking off [Gene] Evans' circle of decadent snobs in graphic and innovative ways.