Trad is an orphan living with his grandfather, who ignores him most of the time. One day, Trad is out on the moors, and finds a wounded knight. Somehow, Trad realizes he needs to hide the knight from his grandfather, which he manages to do.
But as the knight recovers, he feels compelled to complete his great and terrible quest. If he could only remember what it was!
Trad leaves his grandfather, and joins the knight on the forgotten quest… which has an amazing conclusion.
I highly recommend The Great and Terrible Quest by Margaret Lovett for ages 12 and up.