Gray Hunt

From the introduction:

Gray Hunt is an event-based adventure that has the PCs searching for groups of orcs in the Grey Highlands. The very orcs the Zhents have accused of raiding across the River Loagrann. Finding them may not be easy, especially if the PC don’t have an experienced tracker to navigate a dangerous expanse called Grey Highlands. Eventually the PCs search leads them to an old ruined tower sitting atop a hazardous precipice. Therein the PCs find orc raiders. After they subdue or engage in a successfully parley with the orcs, the PCs have a chance of finding out why the orcs are raiding into Zhentarim lands - to rescue kidnapped tribesmembers. The orcs are merely trying to retrieve their people.