From the bestselling mastermind behind the sensational series A Good Girl’s Guide to Murder comes a brilliantly dark, highly propulsive adult debut thriller that flips the conventional locked-room mystery entirely on its head. The narrative introduces twenty-seven-year-old Jet Mason, a young woman residing with her wealthy family in Woodstock, Vermont, who has spent her life waiting for her true purpose to begin. Her routine is completely shattered on Halloween night when an unidentified intruder violently attacks her, causing a catastrophic head injury that doctors warn will trigger a fatal brain aneurysm within exactly seven days. Rejecting a high-risk operation that could kill her instantly, Jet embraces a frantic, ticking-clock ultimatum to maximize her remaining time. Realizing she is surrounded by potential suspects—including her complicated family, her ex-boyfriend, and an estranged best friend turned sister-in-law—she forces herself to reevaluate everyone around her with sharp paranoia. Teaming up with Billy, a trusted childhood friend, Jet embarks on a dangerous race against her own deteriorating cognitive health to solve her own impending murder before her final week runs out.