The Clockwork Firefly

Pendulum is a vast city, clockwork and steam fusing together in a delicate symphony of lies and mystery. When thousands of people disappear from Pendulum, the city is thrown into a state of mayhem, demanding answers and rioting the streets. The people return two weeks later, confused and memories hazy, remembering nothing but darkness from the time that they were gone. All seems well again, despite the whispers in the city that far more is at play than it seems.
Barely a week after the people have returned, airships crash out of the sky and steam trains derail, destroying the city of Pendulum and killing thousands. Pendulum rebuilds, rising from the ashes, and during this time; theories are formed, mysteries are snatched up.
A mysterious alliance known only as the Fireflies; rises up from the burning wreckage of Pendulum. They believe that these two events were not accidents. They believe they are connected.
That the government of Pendulum is behind these malevolent events.
They believe it is not over.
The Fireflies will uncover secrets far more sinister than any of them were ever prepared for, and they will be swallowed by darkness that they never saw coming.