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 la Custard for dinner and often doesn’t remember Jack’s name But 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.