Children have wild imaginations; sometimes, their imaginary friends are written off as harmless. But what happens when that "imaginary" friend knows too much? When does a child's playmate seem more real than make-believe? In this story, a mother realizes that her child’s imaginary friend isn’t as innocent as she first thought. At first, the games and conversations seem typical, but soon, the child begins sharing details about the "friend" they couldn’t possibly know. 

As the story unfolds, the invisible playmate starts making demands, giving instructions, and pushing boundaries in increasingly sinister ways. The child insists the friend is real, and strange occurrences around the house back up that claim—doors closing on their own, toys moving, and cold spots in the child's bedroom. Things escalate until the presence becomes undeniable. It’s not long before the entire family is caught in the grip of fear, with the invisible friend taking control of their lives.