The eighth novel from NUMBER ONE bestselling author, David Walliams – now available in paperback!Jack’s Grandpa…*wears his slippers to the supermarket*serves up Spam à la Custard for dinner*and often doesn’t remember Jack’s nameBut he can still take to the skies in a speeding Spitfire and save the day…An exquisite portrait of the bond between a small boy and his beloved Grandpa – this book takes readers on an incredible journey with Spitfires over London and Great Escapes through the city in a high octane adventure full of comedy and heart.Illustrated by the award-winning Tony Ross.