R. L. Stine

Having fled her dorm room, college freshman Hope is hiding out in an abandoned sorority house on campus. But there is no escape from the evil that follows her—because it has become a part of her.

Attending summer school while a baby-sitter watches her two younger siblings, Amanda Conklin thinks that the kind and trustworthy Chrissy is a perfect guardian, until she learns of the sitter's deadly nature. Reprint.