Are You in the House Alone? (TV Movie 1978)

In this made-for-TV Anne and Neil Osborne have moved to a new town with their virginal teenage daughter, Gail , after being burglarized. When Gail finds a mysterious, threatening note, she assumes it's just a prank. But when more letters arrive -- along with increasingly frightening phone calls -- she realizes she has a stalker and sets out to use her photography skills to catch him in the act.