B9: Castle Caldwell and Beyond is an adventure module published in 1985, for the Basic Rules of the Dungeons & Dragons fantasy role-playing game. It also works fine with modern retroclones like Basic Fantasy RPG. It is intended for player characters of level 1-3.
The module contains five short adventures. The first two, The Clearing of Castle Caldwell and Dungeons of Terror, are designed as connected, successive adventures, while the remaining three are stand-alone scenarios.
Players must defeat the creatures they encounter in the castle and its dungeons, save an imprisoned princess, escape from a prison themselves, and find and return a holy relic that belongs to a church.