The London Eye Mystery by Siobhan Dowd

Fans of "The Curious Incident of the Dog in the Night-Time" will love this book too.

Ted, our narrator, is a high-functioning autistic boy who lives in London. He explains that he isn't sick or anything ... it's just that his brain runs on a different operating system. He works hard to navigate and understand a world that he sees slightly differently than others.

But that difference comes in handy when Ted's cousin Salim goes missing. While everyone else spends time crying, yelling, and worrying, Ted has been thinking through all the pieces of Salim's disappearance. And for once, Ted and his sister Kat seem to be on the same team.

Can they find Salim? Will anyone listen, even if they do figure it out? And what does a duck look like when it forgets how to quack?

I think kids will enjoy discovering the answers.