Linda Newbery 
At the Firefly Gate [EPUB ebook] 

Henry is not happy when his parents move from London to the village of Crickford St. Thomas. But he soon forms a friendship with an elderly neighbour, Dottie, and she starts to tell him stories about the Second World War and about another Henry who was a navigator in the RAF. Then Henry sees a man standing at the garden gate, smoking a cigarette and surrounded by a cloud of fireflies. He appears to look straight at Henry — could he be the navigator? And what is the significance of the ghost’s appearance?