The Heartless (Всеблагое электричество #2)

Once, this world was dominated by the fallen, but humanity cast off their tyrannical rule and created a mighty Empire with colonies spread out across the globe. The power of the metropolis is stronger than ever before, but its past is dark and its future cloudy. Old secrets are capable of destroying in one moment what took years to create. After all, nothing can save it from treason, not armadas of battleships nor bomb-laden dirigibles.
The key to one such secret, by happenstance and inheritance, has fallen into the hands of Leopold Orso, a former police investigator who now works as a private detective. His illustrious talent allows him to bring other people's fears to life, but it also does not help him extricate himself from the web of another's scheming. Defeat threatens to result in imminent death. Victory beckons with the ghost of a chance to escape with his life. His soul is plagued by painstakingly forgotten memories. And to think that all Leopold ever wanted was to get an inheritance that was his by birthright.