The forgotten door

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.