After his mother's death, a young boy, Mark, is left with his aunt and uncle while his father makes an important trip. Cousin Henry is at first great fun, but isn't your average boy next door. Mark believes Henry is evil, but no one else can see this...

After his mother's death, a young boy, Mark, is left with his aunt and uncle while his father makes an important trip. Cousin Henry is at first great fun, but isn't your average boy next door. Mark believes Henry is evil, but no one else can see this.