Ghosts of the Past is a secondary quest available in The Witcher 3: Wild Hunt if a certain Viper was not killed in The Witcher 2: Assassins of Kings. Remember you can complete both this, and The Fall of the House of Reardon, in any order you like.
Important: if the first part of Hazardous Goods isn't done before this quest is started, it will not be available until after this quest is completed.
Note: this quest will fail if not completed before starting The Isle of Mists.
While exploring Velen's countryside near Lindenvale, or taking on The Fall of the House of Reardon contract, Geralt stumbles across a farmstead which is littered with booby traps. After hearing a sound coming form the barn, Geralt decides to investigate. Once you're ready to start the quest, enter the barn and interact with the ladder to get up to the loft, only to find Letho.
Suddenly, men approach the farmstead - clearly no ordinary lost peasants. Letho explains that only one man, a supposed friend, knew where he was, Louis. No matter your choice, he'll basically drag you into the fight so help kill the scouts. Afterwards, Letho will mention hunting down Louis and you can choose to tag along or not. If you want his help later during the Battle of Kaer Morhen, go with him and make sure to stay close, otherwise, if you stray too far, the quest will complete and you'll never see him again.
If you chose to go along, follow Letho on horseback to a small camp where Louis and his gang are located. After some small talk, Letho decides his "friend" is a traitor and must die. Help kill off the gang and then another cutscene unfolds with a badly wounded Louis asking for mercy, and he'll eventually reveal who paid him off. Letho chooses to let him die there from his wounds and heads out to find Arnout Vester. Note: you can choose to kill Louis after the cutscene, though it doesn't grant anything.
Dealing with the Bounty Hunters
Now follow Letho to Lindenvale to see whether Louis spoke the truth. Letho leads you to a hut on the edge of the village and tells Geralt, whatever happens, to not interfere. A cutscene will then play out where Letho blows up a nearby barn to draw out the men inside the hut and a conversation plays out between Letho and Vester, eventually leading to one of the mercenaries shooting a bolt into Letho's shoulder. Letho attacks, taking down most of the men, before falling himself. Geralt then runs forward and has 2 choices: intervene or stay out of trouble.
- If Geralt chooses to intervene, a fight will ensue and the attackers will be killed.
- If Geralt chooses to defuse the situation by insisting he doesn't want trouble, the men will want to claim the bounty placed on Letho and subsequently decide to take his head - an idea Geralt isn't fond of. After some careful persuasion, Geralt manages to convince them to take Letho's medallion instead as proof.
Afterwards, Geralt investigates the corpse of Letho only to discover that a unique poison had been applied, making him only appear dead. When Letho comes around, he reveals that this was his plan all along: to appear to die in front of the bounty hunters so they'll spread the word Letho is dead and he will no longer be hunted. If Geralt intervened, Letho will react negatively as he ruined the plan, but if Geralt stayed out of trouble, he'll be pleased.
Now you can say one of two things, regardless of your previous choice: bid him farewell or invite him to stay at Kaer Morhen. If you choose Kaer Morhen, he'll eventually make his way there to help with the battle. If you don't invite him to the school, he'll instead talk about going to Zerrikania.
- While traversing the inhospitable lands of Velen, Geralt came across an abandoned farming estate. Upon entering the estate's farmhouse, he discovered that, though seemingly uninhabited, it was crammed full of deadly traps. Someone clearly did not want any uninvited guests snooping around the place. Geralt decided to find out who - and why.
- What does one expect to find inside an abandoned country manor? Dusty crockery. Moth-eaten doilies. A moldy trophy buck, perhaps, if its inhabitants trod on the wild side. Certainly not the most wanted man north or south of the Yaruga. Yet that, dear reader, is exactly who Geralt found when he entered such a manor in Lindenvale. The assassin of kings himself, Geralt's old acquaintance, his sometime friend and sometime enemy: Letho. He was hiding there from bounty hunters out for his scalp. Geralt, now fully able to remember how Letho and two of his colleagues once saved Yennefer's life, could not refuse him help.
- If Geralt doesn't go along with Letho to see Louis:
- Somewhere along the way Geralt parted with Letho. To this day no one knows if he did this on purpose or merely got lost, but one thing is certain - the two witchers' paths never crossed again.
- If Geralt does help Letho out:
- What Letho did next proved he was both clever and fearless. In order to get rid of the bounty hunters breathing down his neck once and for all, he took a crossbow bolt to the chest and faked his own death.
- If Geralt kills Letho's pursuers:
- This caught Geralt by surprise, and sadly the witcher doesn't always handle surprises with much tact or subtlety. Instead, he usually does what he did this time, namely murder all and sundry within sword's reach. There were thus no witnessess to spread the false news of Letho's death, and the wanted man was right back where he started.
- If Geralt doesn't intervene:
- This caught Geralt by surprise, but he improvised splendidly. Convinced Letho was dead, Vester and his men rode off to spread the news far and wide. Letho could now simply lie low for a spell and wait for the world to forget about him...
- If Geralt suggests Letho go to Kaer Morhen:
- Geralt proposed that his old acquaintance seek shelter at Kaer Morhen. Letho hesitated, but in the end accepted the offer.
- Search the farmstead.
- Find where the noise is coming from using your Witcher Senses.
- Enter the barn.
- Find a ladder using your Witcher Senses.
- Kill the bounty hunters.
- Ride with Letho and find Louis.
- Kill the bandits.
- Ride with Letho to Lindenvale.
- Accompany Letho around Lindenvale.
- Sometimes this quest will not start if a game is started with a The Witcher 2: Assassins of Kings import even if Letho was left alive. This may be more likely with a NG+ playthrough. The simplest solution is to simulate a worldstate rather than importing a save. It is also possible that importing an autosave after Letho was left alive may be more reliable than importing a quicksave or a manual save.
- Depending how the player looked around the farm to find Letho, Letho's comment will change if Geralt did or didn't set off any traps.