In Search of the Unknown is a module for the Dungeons & Dragons roleplaying game, designed for use with the Basic Set of rules. It was written by game designer Mike Carr and was first published in 1978 by TSR, Inc. The module details a hidden complex known as the Caverns of Quasqueton. Reviewers considered it a good quality introduction to the game that was written in the so-called dungeon crawl style, where the primary goal of the players is the exploration of a dangerous labyrinth to battle monsters and obtain treasure.

The Dungeons & Dragons Basic Set is a set of rulebooks for the Dungeons & Dragons (D&D) fantasy role-playing game. First published in 1977, it saw a handful of revisions and reprintings. The first edition was written by J. Eric Holmes based on Gary Gygax and Dave Arneson's original work. Later editions were edited by Tom Moldvay, Frank Mentzer, Troy Denning, and Doug Stewart.