The Dark Watchman

Publisher's blurb: As the river carves its way through the marsh, the Watchman, a 500 foot tall lighthouse overlooks the passing ships, lighting their way and alerting them to dangers that would lurk in the shadows. But what happens when the shadows extinguish the light, and what purpose do they have? This adventure is designed for a party of characters around the third through fifth level with a combined total of about 20 levels.