I read it when I was 9. It's a fantasy book about a boy who is deaf and mute and a slave and turns out to be a storm lord and true ruler of the realm. It's about how is able to speak by his new master cutting a collar round his neck which contains an enchanted stone which is destroyed. They then discover he is the storm lord teach him how to use his powers and he eventually takes control with a little romance on the side. Has anyone else ever read it and do you remember what it's called? I think ds might like it.