Switch on your Witcher Senses when you reach the abandoned camp, and begin your investigation by looking at the campfire.

Cross it, then head into the forested area ahead of you. Set off and make your way towards the target area, but be ready to kill the nekkers that are lurking around here and making a nuisance of themselves. He'll ask you to make your way over to a camp that's just over the lake that's located to the north-west of the army camp. Work through all of the dialogue options you'd like to with him, and then ask Eggebracht for a spot of work when you're ready to begin the quest itself. The first thing to do is go inside the tent that has the sun markings on it, and then talk to the quartermaster himself, Eggebracht. The note you collect explains that a patrol has gone missing somewhere, and there's a not-too-shabby reward on offer for whoever can track the missing soldiers down. You'll find the board just outside the tent of the quartermaster. This is one of the briefest Contracts you can pick up in the Witcher 3, and all you need to do in order to get it started is approach the noticeboard located in the Nilfgaardian Central Army Camp.

How to kill a wraith witcher 3