The Door in the Wall

I liked this book written by Marguerite De Angeli. Ever since he can remember, Robin, son of Sir John de Bureford, has been told what is expected of him as the son of a nobleman. He must learn the ways of knighthood. But Robin’s destiny is changed in one stroke when he falls ill and loses the use of his legs. Fearing a plague, his servants abandon him and Robin is left alone. A monk named Brother Luke rescues Robin and takes him to the hospice of St. Mark’s, where he is taught woodcarving and – much harder – patience and strength.

The book was published in 1949. It won the Newbery Medal in 1950. The term "door in the wall" means if you keep trying and never give up you'll eventually find a way to succeed.