Shadows Under Thessalaine (D&D / d20 3.0, Fantasy Roleplaying Adventure)

The duchy of Thessalaine is under siege. Fishermen and merchants set sail into the Gulf of Irul Kinthé and never return, leaving the port city of Harwynn's Shoal weeping for lost husbands and sons, and desperate for lost revenues. Pleas sent to Ellgrym's court, begging for aid, are ignored; for Madradur, the duke's capital city, has its own problems. There, the nights are no longer safe to walk; the streets and the sewers swarm with creatures from the depths: grimlocks, orcs, and other, more hideous horrors. And leading them, cloaked in shrouds of darkness, the drow. No men are available to investigate the vanishing ships from Harwynn's Shoal.
One beleaguered province with two very different problems. One stalwart
group of heroes, who may have bitten off more than they can chew, caught up
in them both. Problems that, if they are not careful, might lead them into the grasping tentacles of the greatest underground horror of them all.
Shadows Under Thessalaine is a d20 fantasy adventure for third or fourth level characters.