The monsters ate him. Anubis gently brushes places one hand on William's shoulder. Close-up on William as he struggles to force to the words out. From the folds of his coat, Anubis removes the dog-headed puppet that scared William so badly at his birthday party. Anubis places the puppet in William's hand.
Most dogs are good.
For the first time, we see Anubis's face. But not really. He wears a jackal mask, like the figures from Egyptian myth that Vic read about in the library. Here's the story's ending. The boy came back.