One of the most common is if you go first and start with a spy card which goes on your opponent's side.
Head over and use the key to unlock the Slave cages and lead them to the objective marker nearby and to safety.
Begin by stepping inside of the longhouse and meeting two men by the name of Kraki and Kori, neither of which take too kindly to foreigners.
Follow it to a piece of discarded thread that Cerys says would have come from Arnvald, the man who escorted you at the beginning of the quest.
The Outer Worlds guide: Stranger in a Strange Land main quest walkthrough.
After picking up the quest from a Notice Board, you'll find an objective marker in the south-eastern corner of Novigrad.