Grandpa's great escape

"In his old age Grandpa has become confused. He believes he is back in World War II, when he was an RAF Spitfire pilot. Only one person can understand him: his grandson Jack. When Grandpa is sent to Twilight Towers--an old folk's home run by sinister Matron Swine--it's up to Jack and Grandpa to plot a daring escape. Little do they know, the wicked Matron is on to them ... "--Dust jacket.