Three Sisters of the Glass Mountain

Three missing sisters. A strange beast. A high flame, gleaming in the Fog.

Once upon a time there were three sisters whose joy and hope lit up your Fog-bound Village like a torch. Three days ago, they disappeared into the Fog. No trail, no trace, just the wailing of the Village and a strange light flickering like a red star in the Fog. Search parties tried but found nothing and the Village has lost hope.

Suddenly, a beast bursts forth from the Fog as you break your fast. Red eyed and screaming, it carries a scrap of one of the sister's cloak.

What do you do?