Olara gave you the location of where Brom's camp is. Head over to the camp to scan the area with the Focus. You will find a blood trail. Follow the trail to see where it leads.
Follow the Blood Trail
The blood trail will lead you to a series of clues. You'll first find a knife. Examine it and follow the blood trail once again to a bucket that will lead you to a Shrine.
Examine the Shrine and follow the trail to a destroyed Watcher. Destroy the Scrapper in the area and then examine the destroyed Watcher. This will yet again lead you to another trail to a supply crate and then ultimately to Brom himself. Talk to Brom for a cut-scene and the quest will be completed.