Paul Shipton 
Invisible (Oxford Read and Imagine Level 6) [PDF ebook] 

I’m the greatest criminal in this city. I’ve never been caught by the police, and I never will be caught, ‘ said Cooger. But what was this clever – and dangerous – man planning? And could Ben and Rosie stop him from stealing Grandpa’s inventions – and a lot more, too? Read and Imagine provides great stories to read and enjoy, with language support, activities, and projects. Follow Rosie, Ben, and Grandpa on their exciting adventures . . .