Just adding a recommendation that I don't think I've seen here. DS1 (9) has been gripped by these books by Joseph Delaney - and he is a capricious reader who goes for long stretches without getting into any fiction. The first's called "The Spook's Apprentice" and there are three more. They seem to be mythical/wizarding sort of books involving the 7th son of a 7th son. Anyway, the third one arrived from Amazon yesterday and he couldn't wait to start.