Back to Skellige
In Ard Skellig, south west of the Druid camp, you’ll come across an abandoned sawmill. Geralt will make a comment about the sawmill being abandoned.
Use your Witcher senses to examine the buildings. One of the buildings has a Letter from a Druid, another has a Lumberjack’s Letter to his Wife and a third has the Sawmill Owner’s Notes.
The sawmill has provoked the ire of a Leshen who lives in the woods. Once you examine the human bones in the open shed area the Leshen will appear. Kill the Leshen to complete the quest.