A strong story, but I think the page limit took away from the typical Gillian Flynn charm for me. We have a lot of the same elements at play--screwed-up characters and a plot that leaves you second-guessing yourself until the very end--but the brevity of it meant the last third of the book or so left a lot to be desired. The twist(s?) is/are revealed through a lot of dialogue that didn't quite work for me. The ambiguous ending worked on some level, I think, but also somehow left me a bit disappointed in ways I couldn't put my finger on. 
 Still, it's Flynn, and she's a hell of a writer. My only regret is that I started this way too close to bedtime after a long day and wasn't able to read it in a single sitting, as it should be enjoyed.