The hideout serves as a point of rest, gathering, and socializing for the members of The Family and is located in the sewers. Some of the top lieutenants can be found here, offering various missions. There is also a store that handles stolen goods and sells rogue-related equipment, such as traps and clothing to improve stealth and pick pocket abilities.
Spoiler: Towards the end of Part One the hideout is abandoned after a Dhorn raid against The Family.
"You obviously do not understand the concept of keeping something secret. Secret. That means, not for everybody to know. As in, not bring any of your friends in just because you god damn feel like it!!!" -Alfons Fryar