Three series of children's/young adult fantasy books I'd recommend to anyone:
- The Dark is Rising series, by Susan Cooper. The eternal battle between good and evil, Arthurian myths, the Welsh and Cornish landscapes. Five books.
- The Song of the Lioness, by Tamora Pierce. Knights, superb characters, honour, growing up. Four books.
- His Dark Materials, by Philip Pullman. Vividly imagined, vividly told. Three books.
All three of these series I've read recently, have drawn me a world I've not wanted to leave, have engaged me emotionally. There are worse ways to spend your time.