The fourth book in the internationally bestselling Flavia de Luce series starring "one of the most remarkable creations in recent literature" (USA Today). It’s Christmastime, and the precocious Flavia de Luce—an eleven-year-old sleuth with a passion for chemistry and a penchant for crime-solving—is tucked away in her laboratory, whipping up a concoction to ensnare Saint Nick. But she is soon distracted when a film crew arrives at Buckshaw, the de Luces’ decaying English estate, to shoot a movie starring the famed Phyllis Wyvern. Amid a raging blizzard, the entire village of Bishop’s Lacey gathers at Buckshaw to watch Wyvern perform, yet nobody is prepared for the evening’s shocking conclusion: a body found, past midnight, strangled to death with a length of film. But who among the assembled guests would stage such a chilling scene? As the storm worsens and the list of suspects grows, Flavia must use every ounce of sly wit at her disposal to ferret out a killer hidden in plain sight.