On this page of the Assassin's Creed Valhalla guide, you will find a detailed walkthrough for the Red in Tooth and Claw side quest.
Rewards: 1,200 XP.
In the place marked on the picture above, you will come across a group of angry boars, and there is a man's voice coming from a nearby house.
First you need to deal with boars. Approach the man's corpse on the left to receive a key.
Enter the cottage - the place is a real mess. The man who shouted the words about the curse earlier is dead. Examine his body to complete this task.