Rosemary and her new husband, Guy, move into a new apartment in New York, befriending an elderly couple who live near by. But when another girl in the block commits suicide, Rosemary starts getting more attention than she desires, from all the wrong people. And now with her (late) friend's warnings about witches in mind, she has a new problem - the protection of her forthcoming child. But it may not be the child that needs protection.