Harry Arlo and his dad are from a family of amazing inventors, and are especially fascinated by flying contraptions and all things airborne. Their family motto is: when you're up in the air, you're on top of the world!

But Harry begins to wonder about the top of the world - it feels great, but wouldn't it be interesting to try going in the other direction? His father is bemused. No one in the family has ever thought about taking an ocean-bound journey, travelling down to the bottom of the world. How will Harry get there? And what will he find when he does?

A powerful story about fathers and sons, family ties, having the courage to do something new - and about the glorious wonders of nature and the worlds we have yet to explore.

PRAISE FOR THE MISSING PIECE: 'Such a wonderful book, would highly recommend to anyone with kids or friends with kids!' Ed Sheeran