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Joe Goldberg's voice is the whole engine of Caroline Kepnes's novels. The show borrows it in voice-over, but the books never leave his head, and the result is sharper, funnier and more unsettling than anything the camera can do. You spend every page inside his rationalisations, his snobbery and his running commentary, and the dark comedy comes from how persuasive he sounds while doing terrible things. The page also gives you a harder Joe. The television version keeps reaching for remorse and redemption, and it hands some of his violence to other characters. The novels keep that violence with him and resist the urge to redeem him, which makes the reading far colder and more honest about what he is. Hidden Bodies carries this into Los Angeles with the same nerve, and later books, You Love Me and For You and Only You, continue his story in directions the series never took, so viewers will find genuinely new material rather than a rerun.

Love Quinn becomes a killer on screen, and that single change reshapes everything after the first season. In the books she kills no one: her first husband James dies in a surfing accident, and deaths the show gives to Love, including Delilah's, are Joe's work instead. The first season also ends on a reversal the novel never makes. Candace walks back into the bookstore alive, while in You she is plainly dead, killed by Joe long before Beck appears. The cast grows considerably on television. Joe's neighbour Paco and Beck's friend Annika were invented for the show, and Joe's protectiveness toward the abused Paco softens him in a way the book avoids. Forty Quinn, the television version of Delilah Alves, Ellie and Natalie are either new or greatly expanded. In the books Delilah has only a nameless sister, and Ellie and Natalie do not exist. Peach is reportedly far more suspicious of Beck's boyfriend on screen and dies through a quite different chain of events, though this rests on a single source. The family story splits completely. In the books Joe is paid $4 million and given a home on condition that he stays away from Love and their baby, named Forty. On screen, Joe and Love raise their son Henry together in the third season, in the suburb of Madre Linda. That season has little to do with the third novel, You Love Me, which takes Joe from Los Angeles to Bainbridge Island in Washington and was published too late to shape it. The first two seasons follow You and Hidden Bodies fairly closely, the show then drifts, and the fourth season onward is original. The show's Joe is also more remorseful and more eager to change than the man on the page.