The following chapter provides a detailed description of the gameplay during Sun's Judgement. You will find tips that can help you complete the quest in the most effective way possible.
Starting the quest
The quest will appear in your journal after you talk to the owner of one of the booths in Brightmarket. Turns out that a thief often robs this place. Aloy will have to investigate the assigned place.
Track the thief
Head to the storehouse. You will quickly realize that some of the barrels were misplaced not long ago. Investigate them and Aloy will find footprints that you will have to follow. You will eventually lose the trail and you will have to search the surrounding area.
Examine the Food Pile. Turns out that there are more fruit. Activate Focus and you will find another pile located south from the place where you lost the trail. Follow the scattered fruit and you will reach a large pile. Examine it.
Defeat the machines
Aloy will find more clues that you can activate with Focus. Follow the lead. You will have to climb a rock. On the other side, you will find the perpetrator. Turns out that he is surrounded by Glinthawks. Eliminate them with fire to proceed with the quest.
Although the thief got away, use Focus to find his trail. Follow it and you will find his hideout in no time. After a short conversation the quest will be completed.