Keepers of the Feather

We were asked to fetch a delivery of coffee for Urwin and Danika from a local farm. Urwin advised us not to mention his name, instead using the moniker ‘The Keepers of the Feather’ from the way my letter was signed by Danika. It turns out that there would be much more waiting for us at this place.
 
On arrival, Xaethriell and I were targeted from the group, threatened with death by a handful of strangers. It would be revealed to us only moments later that this was the group that called themselves the Keepers of the Feather. Martikovs, all of them; Urwin’s brothers, sisters-in-law and nephews, all hiding out at this camp in a clearing.
 
We learned that the farm was in disarray, with dead crops and the very real threat of famine looming, all because of some crystals that apparently accelerate growth. They had been stolen, apparently by the hags of Berez, but Devain Martikov placed the blame almost completely on his son’s shoulders.
Urwin was on watch that night when he was visited by Danika, and while his attention was elsewhere, the crystals were stolen.
Devain mentioned a woman named ‘Yang’, saying that Urwin would have been better with her than Danika.
Who was she? It wasn’t something I was concerned about, even before it turned out that she had passed on somehow.
 
Returning with the delivery, we were eager to discuss our findings with Danika and Urwin. However, once we mentioned the crystals and Urwin spoke of Danika’s sister, she fled.
I need to find her, she could be in grave danger.