Gone Girl
The Girl on the Train was published as the heir to Gone Girl for good reason — both are dual-perspective thrillers in which the marriage is the crime scene and the narrators cannot be trusted. If you've read GOTT but not Gone Girl, the order of operations should have been reversed: Flynn's novel is the more structurally radical, the more morally provocative, and the one that established the conventions the others work within. Read it immediately if you haven't. If you've read both: the rest of this list is for you.
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