The new quest will become available after unlocking Origin as a destination on the world map and completing the quest "Priceless" in the main scenario.
More specifically:
- Complete the side quest "Cut from the Cloth."
- Complete the side quest "Phoenix, Heal Thyself."
- Complete the side quest "Where there's a Will."
- Reach the main scenario quest "Back to their Origin."
After completing these steps and talking to Jill, the quest "Priceless" can be accepted in Clive's hideaway.