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 strange planet, Earth, and that he is in great danger. Soon the family who befriends him is in great danger, too. There is very little time left. Jon must find the secret way back to his planet--before it's too late." You can't help but like Jon, he's friendly, doesn't lie, is gentle and kind to animals. In other words he sticks out like a sore thumb. His present surroundings are familiar and not familiar, somehow not quite right. And the other humans, he's sure they are also humans, are not like any he knows. With the locals out alien hunting and the government getting involved, Jon is in a tight spot. Thomas