Pierremons tells you to follow the two sets of footprints to look for signs of Biggs and Wedge.
Requirements
This quest is available if you have completed the quest Eyes on the Empire.
Starting the Quest
Talk to Pierremons in Coerthas Central Highlands to begin the quest.
Search the Area for Footprints
Go northeast to the orange circle on the map and examine the footprints. Afterward, go farther northeast and examine the footprints there. Keep going to the locations marked on the map and examining the footprints that you find.
Search Under the Bridge
Eventually, there will be a quest marker to the northwest. Go there and check under the southeast end of the bridge. Talk to Wedge. There will be a cutscene.
Make Your Way to Monument Tower
Go west to where the orange arrow is pointing on the minimap. Enter the tower and talk to Abelie to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Wedge to accept the next quest: Monumental Hopes.