Tim helps out in Mr McMarvel’s workshop. He oils machines, like the Clop-a-Hopper-Travelling Machine and talks to Mr McMarvel’s very polite robot, Rupert. Tim is horrified to discover that the workshop is in trouble. The arrival of creepy Max Fish puts the inventor and his amazing machines in danger. Can Tim and Rupert thwart Max’s plan and solve Mr McMarvel’s problems?
