Apparatus Infernum Series by A.A. Aguirre

Hy Breasil is grimmer than it used to be. Before the Architect closed the door, there were regular crossings, and a great war decimated both humans and Ferishers. The native fae who refused to treat with the invaders faded; their bodies withered and died, stranding them as hungry, angry spirits that haunt the countryside. That means there’s always trouble brewing in Dorstaad... moreHy Breasil is grimmer than it used to be. Before the Architect closed the door, there were regular crossings, and a great war decimated both humans and Ferishers. The native fae who refused to treat with the invaders faded; their bodies withered and died, stranding them as hungry, angry spirits that haunt the countryside. That means there’s always trouble brewing in Dorstaad. Janus Mikani and Celeste Ritsuko work for the Criminal Investigation Department, keeping citizens safe from things that go bump in the night. He’s a hardboiled cynic with an uncanny sixth sense; she’s determined to justify her promotion as the first female detective in her division. Together, they’re trying to keep a black tide from drowning the city. But when the second body surfaces, murdered with the same type of infernal device, the entire CID must face the truth. There’s a madman on the loose, twining magic and blood… and only Mikani and Ritsuko can unravel the intricate, lethal conspiracy before the Royale killer completes his macabre plan, unleashing old, forbidden magic on an unsuspecting populace. If the maniac succeeds, it could mean the end of everything… less

As powerful magic comes creeping back, dangerous days are dawning…... Criminal Investigation Division inspectors Janus Mikani and Celeste Ritsuko were lucky to make it out of their last mission alive. Since then, strange troubles have plagued the city of steam and shadows, apparently as a result of magic released during the CID inspectors’ desperate interruption of an ancient ritual. The fabric of the world has been unsettled, and the Council has assigned Mikani and Ritsuko to investigate... moreAs powerful magic comes creeping back, dangerous days are dawning…... Criminal Investigation Division inspectors Janus Mikani and Celeste Ritsuko were lucky to make it out of their last mission alive. Since then, strange troubles have plagued the city of steam and shadows, apparently as a result of magic released during the CID inspectors’ desperate interruption of an ancient ritual. The fabric of the world has been unsettled, and the Council has assigned Mikani and Ritsuko to investigate. They soon discover that matters are worse than they imagined. Machines have developed minds of their own, cragger pirates are raiding the seas with relentless aggression, and mad elementals are running amok. As the chaos builds to a crescendo, Mikani and Ritsuko must fight a war on two fronts—and this time, they may not be able to turn the deadly tide…. less