Following a bizarre accident, a six-year-old girl and her four-year-old brother wake up to discover all the doors and windows inside of their house have vanished. All phones are dead, and the cable is out. Their father (sole custodial parent) is also missing.
After a night sleeping in the walled-up house, odd things begin to happen. Things go missing. Odd sounds emanate from upstairs. Lights turn off by themselves. After a while it becomes clear that something is watching over them.