Young Tristran Thorn will do anything to win the cold heart of beautiful Victoria—even fetch her the star they watch fall from the night sky. But to do so, he must enter the unexplored lands on the other side of the ancient wall that gives their tiny village its name. Beyond that old stone wall, Tristran learns, lies Faerie—where nothing not even a fallen star, is what he imagined.
In my opinion, the few things that were changed like the wall guard worked better on a screen than a strict adaptation would have too. (Also, I always read it as Tristan anyway.