This episode in the life of Roderick Alleyn takes place in France and involves his wife and son. While the bulk of the stories take place in Britain, Ngaio Marsh changes up the locale occasionally, which keeps the series fresh, I think. I miss the characters on his team when he's away from home, but I love his relationship with his wife, Troy, and now his son, Ricky.
En route to a family vacation on the French Riviera, Inspector Roderick Alleyn glimpses from the train a shocking tableau. In a moonlit window a white-robed figure raises a knife to a woman's shadow. Thus begins his incognito exploration of the Chateau of the Silver Goat...where a jet-set cult's "Way of Life" could spell death for a maiden lady of certain age---and even for Alleyn's own young son unless he can unveil its illicit mysteries.