Fell monsters inhabit a network of caves on the borderland between savage wilderness and frontier civilization. Can the heroic adventurers root them out and save nearby towns and villages from attack? The Chaotic Caves is an adventure module for the Basic Fantasy Role-Playing Game. It includes a town setting, a small wilderness area with a number of keyed encounters, a set of underground lairs for various monstrous creatures, and an abandoned manor house. The Chaotic Caves is suitable for a group of first to third level characters, and a number of pregenerated characters are provided for those who wish to get underway quickly.