Meet Crank and Al ... robots on the run.

When the friends arrive at the travelling Iron City, Crank hopes they can all become world-famous powerball stars. But things aren't quite what they expected them to be.

Our heroes soon discover that powerball is more than just a game ... it's a matter of life and death, and it takes more than goals for a team to survive.

A refreshed cover look for this well-loved series, illustrated by the incomparable Mark Oliver. Read on with The Tin Man, Tunnel Racers, Razorbites, The Ghost Sea and Aquanauts.

This is book 4 in Robo-Runners .

This book has been graded for interest at 7-9 years.

There are 112 pages in this book. This book was published 2013 by Hodder & Stoughton General Division .

Nicola Moon lives in Swindon. She has written several books for young children, including the best-selling Lucy's Picture. Mark Oliver is a very successful illustrator who has previously illustrated Speak Up Spike, a Go Yellow Banana by Franzeska G. Ewart. Damian Harvey has worked as a hospital radio presenter, painter-decorator, and swimming instructor, as well as writing several books for children. He lives in Blackpool, Lancashire.