Missing in Action

Missing in Action is a secondary quest in The Witcher 3: Wild Hunt which occurs during the prologue of the game. It can be started either by reading the appropriate notice on the notice board in White Orchard or by speaking with Dune nearby the ransacked village. This quest must be completed before you complete the quest Lilac and Gooseberries by speaking to Vesemir in preparing to leave White Orchard.

Quest Description
"As it turned out, Geralt was not alone in searching White Orchard for a lost loved one. The witcher also found the notice of a peasant who was seeking his brother. The brother had left home to take up arms against Nilfgaard.  The Forces of the North and the Black Ones had then clashed in great battle near the brothers' home village and the peasant had not heard from his brother since."

- Dandelion

Find Dune Vildenvert
If Geralt discovered this quest via the notice on the notice board in White Orchard he will first have to find the person who wrote the request for help. Dune Vildenvert, the man requesting aid searching for his lost brother can be found muttering to his dog sitting outside a destroyed hut in the ransacked village marked on the map of White Orchard. When Geralt speaks to him he explains the search he's undertaken to find his lost brother Bastien and offers to reward Geralt if you aid him.

Meet Dune near the battlefield
When Geralt agrees to help Dune find his brother he asks to meet at the battlefield when Geralt is ready to begin searching. Follow him there or meet him when ever is convenient. Once Geralt speaks to Dune at the battlefield he will advise searching the site for Temerian shields with flowers drawn on them which indicate those carried by new recruits from his village.

Search Temerian shields
The area marked on the map will indicate where to begin your search, Geralt will have to defeat a few necrophage ghouls prowling the area before beginning his search. Use witcher senses to help located the Temerian shields if necessary, although they are rather easy to spot and their blue color makes them stand out. After inspecting the burned corpse of a fallen soldier Hussar will pick up the scent of Dune's brother, Bastien.

Follow the dog's trail
Just head for the dog or use witcher senses to follow the dog's trail of prints to an abandoned cabin. As Geralt approaches the cabin a cut-scene occurs. Geralt finds Bastien badly wounded sitting and talking with a Nilfgaardian Soldier, Rhosyn, also wounded. Bastien explains how the they helped each other reach this cabin after being wounded and demands that Dune help both him and Rhosyn return home. Dune is skeptical about taking in a deserting Nilgaardian soldier which leaves the decision of Rhosyn's fate for you to decide. If you believe it is too risky for Dune and his family to harbor a deserter, Rosyn will die in the cabin. If you convince Dune to help Rosyn because Rosyn helped save Bastien then he can be found later living with Dune and his family south of White Orchard village. Either decision ends the quest and you are rewarded with a bit of coin and XP.

Closing Quest Description
"Geralt was far from the only person in White Orchard looking for a lost loved one. War had divided many families, including that of a certain villager whose brother went missing after the last big battle. Geralt was short on time but still agreed to help.  you're surprised, dear reader - but you shouldn't be.  The witcher might seem grumpy at times and downright cynical at others, but he rarely passes by another man's misfortune without seeing what he can do to help.  Though pressed for time, Geralt decided to find Dune Vildenvert and then agreed to help the man.  Be not puzzled, dear reader, for though the witcher oft appeared a surly scoffer, deep inside he was a sensitive soul, unwilling to look upon human grief and dismiss it.  Geralt and Dune began their search where the missing man had last been seen: the battlefield.  Yet while the witcher started the investigation, a mutt named Hussar who finished it for him. When the dog caught its owner's scent, it raced off, following the trail while barking its brains out and not caring one whit if Dune or Geralt were following after. It turned out the missing brother had been heavily wounded but had survived the battle nonetheless... saved by a Nilfgaardian deserter."

- Dandelion