Rachel is introduced to a viral craze of allowing people who living the walls out into the world. This ends up badly and when her parents don't believe her two kids from her school do as they attempt to fight back against these creatures.
After the death of her sister, a woman is visited by a man looking to solve a series of murders by a motorcycle maniac. As their shared fear grows, the killer's rampage continues, leaving them both questioning who the real monster is.