Trying to remember a book. I read it as a tween in the late 80s. Here’s what I got so far:
- A boy has to go on some kind of quest in another dimension (kind of like Narnia in that it was right there, but in a different universe that he got to by some normal way).
- He is on the quest for someone else (don’t know who).
- He is walking along some road and he can’t leave the road for any reason - if he does he’ll never return
- At one point he is assigned a task by people (or creatures) he meets on the way: he must climb a tree and get a fruit for someone, but no matter what he must not eat the fruit and he must not look down or .... something really bad.
That’s what I got. I read it in the late 80s, but it could’ve come out any time post World War II I’d guess.