The second book in the A Charm of Magpies series, A Case of Possession by K. J. Charles continues the story of Lucien Vaundrey, the veritable Lord Crane, and his lover, the magician Stephen Day. Things have grown more complicated for the pair. Someone is trying to blackmail Lucien about his relationship with Stephen, knowing the information could ruin both men. At the same time, Stephen is under investigation for his sudden increase in power, the other justicars worrying that one of their own is using dark, forbidden magic. All the while, there is a strange new problem plaguing London. Giant, terrifying rats have been spotted, and people are starting to turn up dead.