Young Cass Thompson invites her friend Kelley Branscombe over for the night. But her annoying brother, Brion, has unearthed some kind of flagstone and insists he sees some strange person lurking outside.
Cass convinces her mom and dad to let Kelley stay the night as her parents announce they are leaving, but there is one condition: her boyfriend, Eric Pearlman, cannot come over.
Who comes over next? Who has never left?
