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Killing Sadie is a young adult thriller by debut author Rachel Peterson, set for release on August 4, 2026, from Simon & Schuster Pulse. The story follows the murder of popular high schooler Sadie Cooper, told through the conflicting accounts of her twin sister, boyfriend, and best friend, who are all unreliable narrators, with the truth revealed in a final perspective from Sadie herself before her death. It\'s a mystery about rivalry, jealousy, and betrayal, perfect for fans of authors like Karen McManus and Holly Jackson.
