Starless and Bible-Black by Tyler Kimball

This concerns you: the apostles of a divine black hole have invaded the afterlife to pull the plug on a dying universe.

The stars are dead. Their orphans huddle together for warmth in the Realm of the Iron Sky, a refugee camp built on the remains of a million fallen empires and gods slain in some inglorious Ragnarök.

The Shadowlands Syndicate is a detective agency investigating disturbances in the bleeding edges, dreamscapes, and legal and liminal grey-areas between the Realm's desperate, declining civilizations. One Syndicate crew uncovers a vast conspiracy between a bodysnatching alien acid casualty, a predatory horde, the resurrected agents of an apocalyptic, anthropic church, and scheming ambassadors who came in from the Cold.

Starless and Bible-Black is a science-fiction epic of entropy and an introspective look at the battle between hanging on and letting go.