This Edwardian country-house murder mystery follows the usual script of assembling an odd assortment of family, friends, and what-the-heck-are-they-doing-here characters, identifies certain characters (ideally more than one) as worthy of murder, establishes murderous motivations for most of the cast, with a handy storm to pen everyone in at the crisis. The mystery here is solid and even--if you haven’t read the book this is a prequel to--carries just enough doubt regarding the motivations and guilt of some of the more likeable characters to keep one on edge.