Dark Water Falls.

The cottage is located between Sarenti Farm and Nilheim, just north of the treasure hunters. Examine the cottage and you will find a quest. It's a little adventure to save from bandits - but you do have to look for the lair - no cheat marker. There are several additional ways to save victims. He is fully voiced. If you are single (or have more than one adopted child), the adventure gives you the chance to get married. One chance, he doesn't come back. There is no amulet of Mara, but it is connected to the marriage quest.