In the new age of gaslamps and steam, the world's oldest threat is all but banished to the corners of mythology, considered nothing more than stories meant to scare children. The airship Aetheron has always had a reputation for taking ordinary people on adventures, but on this voyage beyond civilized borders, they find terrifying evidence that humanity's old enemy is not only alive, but thriving, and ready for revenge. On the run and unable to trust anyone, it is up to the crew of the Aetheron to stand and fight against a foe that haunts their nightmares.