The Fleet Street Murders (Charles Lenox Mysteries Book 3)

Called "absorbing" (Publishers Weekly) and "beguiling" (The New York Times Book Review), The Fleet Street Murders from Charles Finch finds gentleman detective Charles Lenox investigating the mysterious, simultaneous deaths of two veteran newspapermen, while engaged in a heated race for Parliament.
It's Christmas, 1866, and amateur sleuth Charles Lenox, recently engaged to his best friend, Lady Jane Grey, is happily celebrating the holiday in his Mayfair townhouse. Across London, however, two journalists have just met with violent deaths—one shot, one throttled. Lenox soon involves himself in the strange case, but must leave it behind to go north to Stirrington, where he is running for Parliament. Once there, he gets a further shock when Lady Jane sends him a letter whose contents may threaten their nuptials.
In London, the police apprehend two unlikely and unrelated murder suspects. From the start, Lenox has his doubts; the crimes, he is sure, are tied. But how? Racing back and forth between London and Stirrington, Lenox must negotiate the complexities of crime and politics, not to mention his imperiled engagement. But as the case mounts, Lenox learns that the person behind the murders may be closer to him—and his beloved—than he knows.