MACHINES, MYSTERIES AND MAYHEM - THIS MUST BE A CASE FOR OLLIE SPARK.

Ollie Spark loves mending machines and solving mysteries. But he gets more than he bargained for when fixing Aunt Caz's van throws him into a real-life spy adventure!

Ollie is whisked away to a mysterious city with strange plants, an unknown language and suspicious people round every corner. With the help of Gasket, his new dog best friend, he sets off on a mission to save the city - and Aunt Caz - from disaster.

Can Ollie fix things before it's too late?!

Gillian Cross and Alan Snow