Gates of Smoke

Publisher's blurb: This planar adventure...begins with a touch of shadow fey intrigue, steps up to deadly altercations with Mammon’s servants, and includes a quick trip to Smoketown, right on the edge of the Hells. Demons, fey, and devils all seek advantage, as the Lord of Wealth, Mammon himself, seeks to control the entryway to the Hells entirely.