Gilded Wolves by Roshani Chokshi

It’s 1889. The city is on the cusp of industry and power, and the Exposition Universelle has breathed new life into the streets and dredged up ancient secrets. Here, no one keeps tabs on dark truths better than treasure hunter and wealthy hotelier Severin Montagne-Alerie. When the elite, ever-powerful Order of Babel coerces him to help them on a mission, Severin is offered a treasure that he never imagined: his true inheritance.