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Left from the "Forest" location on Travel map, there should be "Brigands Camp" location. That is where you need to look for noble. I don't remember exactly, but you might need to send adventurers to investigation to unlock it (if it does not auto-unlocks).

I spent 3 hours on this quest, but I never completed it. I still don't know how to do it, this lock is too incomprehensible and complicated