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On the road between Yantra and the Sarrasin Grange you’ll find two bards, Victor and Gascoigne. If you go up to them they’ll invite you to sit down.
Time will fast forward to night time and the two bards will be drunk. They’ll invite you to one more drink. If you refuse the quest will end. If you do take one more drink time will once again fast forward to day time.
In the morning all of your belongings, including your clothes will be gone. Use your Witcher senses to follow the tracks and you’ll find the two bards hiding behind a tree talking about selling your goods. You can either ask for your things back or demand they give you theirs as well. Either way the quest will end.