Many years ago Grandpa was a World War II flying ace but sadly he is now suffering from Alzheimer's disease, and when his family can no longer look after him he is moved to Twilight Towers, an aged care home. However, it soon becomes clear that Miss Dandy is running Twilight Towers for her own ulterior motives and it is up to Grandpa and his grandson Jack to make a daring escape. Based on an original book by David Walliams.