From publisher blurb:
In Tainted Water, the characters are about to start their first real adventure. They rest in a small tavern in the town of Drake's Pass when a woman from a neighboring farm comes with a harrowing tale. Marianne Vadalia says her family's farm was attacked by strange, shapeless monsters that emerged from the water well and killed her sibling. Her father and another brother are still at the farm, they stayed behind while she ran for help.
The characters and a group of valiant peasants rush to Vadalia's Farm to find the root of the problem and, if possible, save Marianne's relatives. Soon, the would-be adventurers find a network of caverns under the house and a strange tomb that has remained hidden under the plantations. The imprisoned spirits of vile mages were interred therein. But now, they have broken out of their cages...