The Sword in the Stone
TH White
This delightful retelling of the legend of King Arthur includes a plucky orphan named Wart, a hapless Merlin, a forest outlaw named Robin Wood (Wood, mind you; not Hood)… a delicious platter of medieval treats.
Ordinary Jack
Helen Cresswell
The first book in The Bagthorpe Saga, Ordinary Jack features a family of eccentric geniuses with one ordinary brother. When Jack sets out to raise the morale of a dog named Zero, his plans go up in smoke. And flames. One of my favorite books from childhood.
Watership Down
Richard Adams
Another fave. Adams writes an epic of Homeric scale about rabbits seeking a place to call home. The final battle is as gripping as any story ever told.