A family comes back from their vacation early so they invite their house sitter to stay until her next job. At first, Rebecca is a godsend - she cooks, cleans, and does laundry. But the family soon discovers that the woman is not as innocent and sane as she appears. Since they have been gone, Rebecca has not only grown very attached to the house, but to its owners. Seeing their pictures and going through their things, she's created a whole world in her head of who they are. Now that they are back, she isn't simply satisfied being a guest. She wants to be a part of the family. And she'll do whatever is necessary, including murder, to make her wish come true.
Aired in United States December 27, 2015