Thieves of Lankhmar (LNA1), adventure for AD&D 2nd ed, by Nigel Findlay.
“Thieves of Lakhmar is a companion volume to the AD&D game accessory, Lankhmar, City of Adventure and further enhances the exciting, dark, and dangerous setting of that Nehwonian city. Thieves of Lakhmar is the definitive sourcebook for any and all who are interested in the Thieves’ Guild, perhaps the most powerful single guild or organization in Lankhmar. Existing knowledge on every aspect of the Thieves’ Guild (its operations, principal officers, members, history, hidden agendas, the famed Thieves’ House) as well as pertinent information on the guild’s principal nemeses in Lankhmar is contained in these pages. Additional data on Lankhmart government and justice and settings for further adventures in the City of the Black Toga are here also. Indeed, this tome is a wealth of information for any who earn their livings in Lankhmar by “procuring” others’ wealth – and for those who may cross or fight them.”