A pillar of shadow encases the city of New York, and nothing that goes in comes back out again. Seems like the perfect job for Gravelight Division, a group of highly trained supernatural specialists.
This edition of the Seventy Maxims for Maximally Effective Mercenaries is an in-world artifact containing handwritten notes from Karl, Kaff, Schlock, and Murtaugh along with all the maxims. hardback 80 pages.