Who stalks the fog-shrouded alleys of the night? Who rules where the City Watch fears to tread? Enter the secret organized underground of thieves, pickpockets, cat burglars, upright men, and kingpins. This 96-page book includes eye-opening details about thieves' guilds, a complete underworld organization, new adventures, and magical items. Also included is a full-color poster map showing an elaborate thieves' hideout in great detail.