Lucy Boston’s The Children of Green Knowe (1954) is one of the most enchanting children’s books ever written, set in the perfect time and place. The time is unspecified, but it would seem to be after the war, when trains still stopped at little stations like the one called Penny Soaky. It’s not long before Christmas and there will be snow. It is also a time when a little boy like Tolly, who is 7, can travel on a train to his unknown great-grandmother all by himself.