The forgotten door

This is a Scholastic book I got around 1965-66 while in grade school. The book is 140 pages with a drawing at the beginning of each of the 12 chapters. I think it's cover, which is the original, is somehow more intriguing than the later releases. The portion of the following text in quotes is the description off the back cover because it's a really good summary. "Who is the strange boy who can talk to animals and read people's minds? Where does he come from? The boy, Jon, has lost his memory and does not know. He only knows that he has fallen through the forgotten door to the strang…