Grandpas Great Escape

I have been reading Grandpa's Great Escape by David Walliams. So far the grandpa is having a bad dream. He thinks he is dreaming about flying a world war fighter jet and he has gone up to the roof of a mall in their small city. They tried getting him down but he wasn't listening so Jack,his grandson, said some fighter jet commands and he listened.

With reading this book I need to visualise more because there are hardly any pictures and my goal is to get up to page 50 by next week.