When Jill Johnson was hired to babysit a couple of kids in the outskirts of town, she hoped to have some peace and quiet time for herself. However, she didn't bargain for incessant phone calls from a stranger that becomes more threatening the more the calls came. Things got worse when she found out the calls were made from inside! Now, Jill must fight for her life, while at the same time protect the children she's responsible for, as she tries to outsmart the stranger in his own game.