From the publishers blurb:
People here just call it 'the old watchtower.'
To the shepherds and merchants who pass by, it's nothing more than a landmark. Young lovers sneak away to carve their names on the weathered stone walls. Among the locals, the structure is widely believed to have been the military outpost of some forgotten duke.
It was not.
Hidden beneath the ruined watchtower is a dark relic from a forgotten age.
Underneath the Ruined Watchtower of Some Forgotten Duke is intended to be an early adventure for a mixed party of 1st and 2nd level characters. There's a good mix of dangerous social tensions aboveground and dungeon weirdness below. Most groups complete the adventure in a single long session, maybe two.
This adventure is part of a series of lovingly handcrafted zine-style OSR modules, intended to showcase unique and consequential locations for low-level parties to experience in the oldschool, exploratory style. They are generally compatible with Basic Fantasy, Old-School Essentials, and most other OSR-style games.
Don't let the small page count mislead you, this module is formatted to be as compact as possible for use during a game session. It's designed to be printed on four sides of Ltr/A4 paper and folded in half, zine-style, easy to reference. Screen and print version are included.