This is the first of five quests to obtain pieces of the Key to the deva. Talk to Tainted Barse, the innkeeper at the Traitor's Gate Tavern. Barse will tell you that his daughter Jasilya has been kidnapped slavers and he will refer TNO to Marquez for more details. Jasilya and her captors can be found in Inner Curst in the east.
Tip: Rescue Jasilya (at 5 on the Inner Curst map) BEFORE talking to Marquez (found in the Traitor's Gate Tavern), for TWICE the XP!