Once again, if you are looking for good, kid tested stories, you can't go wrong with these.
By the time we get to Christmas they'll be telling me the way to read a book.
Sam is lonely. Fred is an imaginary friend who gets to stick around only until his person finds a real life friend. He's moved on a lot and is used to the routine. He knows the signs. But he and Sam really bond and Fred doesn't want to leave when life turns around for Sam.