Give it a couple of years, but I Am David by Anne Holm is wonderful.
As are The Silver Sword and There's No Escape (and pretty much everything else) by Ian Serraillier.
The Sherlock Holmes stories are perfect for slightly older kids too - expands their vocab, teaches them a bit of history and obviously very entertaining too.
CountZero - Member
Arthur Ransome's books are a must. Very much of their time, (between the wars), but great storytelling, and just as enjoyable for adults; I'm gradually getting the whole collection in iBooks.
I only read Swallows and Amazons for the first time last year - what an utterly joyous book.
Currently collecting the others myself.
It's never too late to read a good book.