Get the Backwater Bundle, which includes the Core Rulebook + Backwater Adventures.
Every bundle purchase adds a free community copy of the Backwater core rulebook for those who can't afford it.
The Backwater core rulebook is approximately 220 pages and includes character creation rules, rules for the D20 game system, setting information for players, setting information for GMs, and NPC/monster stats. It also includes four pre-generated character sheets and a blank character sheet.
Backwater Adventures: The Prince of Darkness is a Gentleman (PDF, 107 pgs) includes the "Southern Comfort" and "The Devil Came Down" adventures, two one-sheet adventures: "Full Boar" and "In My Death," and a solitaire game, "Eulalie's Curse." These adventures are set in and around New Orleans, within Backwater ward. The adventures and solitaire game can be played separately or combined to introduce a main antagonist (or possibly a patron?) for the player-characters: the Prince of Darkness himself, Mr. Scratch.
Includes the following games: