Children! Children!
The setting is the apartment of the Collins family in the Gramercy Park neighborhood of New York City, two hours before New Year's Eve. Philip and Evelyn Collins, parents of preteens Mark, Bobby and Susan, attend a new year's party with Dr. Yaeger and his wife Peg. The new babysitter Helen Giles, having just recovered from a nervous breakdown, is subjected to the children's devious and sadistic abuse, sexual passes, and a fall down the stairs. The returning parents believe the sitter is still mentally unsound, after which the parent's own viciousness is revealed to be the source of the children's behavior.