Module cover is in very good condition with light wear, interior pages are very good with light marks on some pages.
Module B1: "In Search of the Unknown," forms a complete adventure for use with Dungeons & Dragons Basic Set. It is especially designed as an instructional aid for beginning Dungeon Masters and players, specifically created to enable new Dungeon Masters to initiate play with a minimum of preparation. In addition to descriptive and situational material, this module also includes special informational sections giving background history and legends; listings of possible monsters and treasures, and how to place them; a list of adventuring characters; tips on various aspects of play for the Dungeon Master; and helpful advice for starting players.
Many years ago two wealthy adventurers, Roghan the Fearless and Zelligar the Unknown, built a hidden complex known as the Caverns of Quasqueton. From this base they conducted their affairs away from the prying eyes of civilization. While of questionable ethical standing the two drove back a barbarian invasion and gained the support of locals. Eventually they gathered their own army and went on an expedition against said enemies where they met their demise.
The player characters enter the story at this point hearing a variety of rumors provided in the module. Each PC knows one or more of the stories although the veracity of them is somewhat questionable. The rumors mostly involve a great treasure hidden somewhere in the Caverns of Quasqueton.