This mystery can be found in the centre of Lincolnscire, north of Lincoln.
Read the Note on the Tree and Rescue the Hunwald Lookalike
When you approach the mystery area you may hear the Hunwald lookalike shouting for help. There’s no need to worry if you don’t, he’ll be along soon. For now you can read the note on the tree for some context surrounding the situation. Now that you know the local soldiers are seeking to punish Hunwald, all you need to do is search for the lookalike.
Once you find the Hunwald lookalike (he’ll most likely be tied to the back of a horse), all you need to do is kill any soldiers in the area and free the lookalike. You can then speak with him to complete the mystery.