The Incendiary's Trail - Rilegato

Murder is rampant in Early Victorian London. Detective Inspector Newsome of the new Detective Force decides to recruit a recently-apprehended master criminal to help bring the culprits to justice. A polymath with a mysterious past, the man is no eager volunteer.
And when the ghastly murder of conjoined twins galvanizes the city, Newsome blackmails his prisoner - Noah Dyson, as he calls himself - into working with the Force's finest: Sergeant George Williamson.
Unknown to the policemen, the criminal genius behind the murder shares a dark past with their new associate. It is not justice that is on Dyson's mind, but retribution. As Williamson and Dyson together close the net, the murder-rate soars and the streets of London begin to burn.