Shiny Pippin and the Impossible Door- Harry Heape

Pippin and her little mouse Tony are playing hide-and-sleep in Granny's garden, when Pippin peeps into the shed and sees a very strange door that she's never noticed before. How did it get there, and where does it lead to? Well, one thing it leads to is a crazy new adventure for Pippin, Granny, Mungo, Tony, and Oddplop the frog. Soon they are on the trail of evil Doctor Blowfart and his thieving ghost monkeys Lumpkin and Bachacha, to recover a very important magical golden mayoral chain!