Classic Children's Literature
They're classics for a reason...
The Adventures of Sherlock Holmes by Sir Arthur Conan Doyle
If not strictly a children's book, we certainly read it when we were at school and it makes for a challenging but rewarding read. We've found alternating reading these short stories with Anthony Horowitz's Diamond Brothers series with Y6 worked very well indeed.
Lord of the Flies by William Golding
Perhaps not for every primary school teacher as it can get a bit gory at times, but we've read it with at least Y6 classes every year for the last decade and found it to be a brilliant vehicle for teaching not just English, but exploring a whole range of ideas. And we've got a planning unit for it: Lord of the Flies