In Night Music, the fourth book of the Seraphina Fox Mystery Series, London's most famous (and fraudulent) medium enters the world of opera-and turns it on its head. Hired to finish a dead librettist's last work, Madame Fox can see the headlines now: "The First Opera Ever Written Via Spirit Communication!" Of course she's no musician, but then she's no medium, either. Producing an opera should be just the thing to burnish her name and reputation among the highest circles of London society. That makes it extra annoying when the police find one of her business cards at a murder scene. And it's a low-class murder scene at that. The New Moon Murderer, as the press have dubbed him, has been slaughtering prostitutes in London's East End. Every month, on the dark of the moon, he claims another victim. There can't possibly be any connection between a murderous madman and Madame Fox's latest commission-or can there?