Twisted Firestarter

The quest begins by talking to the Blacksmith in White Orchard, who will tell Geralt how someone burned down his forge. If Geralt says that he can find the arsonist, the blacksmith will offer gold and suggest checking for clues behind his house.

Go behind the house and use your Witcher senses to find and follow the tracks and clues. The trail will eventually lead down to the river. Go under the bridge and you'll find that the arsonist ran into a Drowner, was wounded, and the trail picks back up again. Follow the trail into a house and use your Witcher senses to find the drunk culprit (Napp) hiding in a back room. Napp will offer a bribe for Geralt to drop the whole thing.

If Geralt refuses the bribe, he can either use Axii (extra XPs) or brawl with Napp. In either case, Napp staggers down to the blacksmith. The blacksmith will call over some soldiers, who will take Napp away, presumably for a summary hanging. The quest will complete, Geralt will receive 20 gold, the offer of the blacksmith's services, a discount on the blacksmith's goods and a total of 92 XPs if Axii was used to convince Nap. Geralt will somewhat fewer XPs if he had to beat Napp into submission.

If Geralt accepts the bribe, Geralt will receive 20 gold and a total of 67 XPs. Upon reporting failure to the blacksmith, the smith will offer his services, but will charge Geralt full price for his goods and services. Oddly, the smith's later conversation options match with Napp being turned in, even if he wasn't.