Author: Cross, Gillian, Snow, Alan
General fiction (Children's / Teenage) 
Published 06/01/2022 by David Fickling Books in the United Kingdom as part of the Ollie Spark series 
Paperback | 240 pages
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?!