The 1959 film is astounding, really beautifully made with heartbreaking performances. Fred Astaire is incredible in one of his few (maybe his only) roles that didn’t involve singing and dancing.
I bought a beat-to-hell 1960 paperback edition (with red-edged pages) at a thrift store for 25 cents a couple years ago. It has a photo insert with stills from the movie. Never got around to reading it though, will have to get on that.