Jehantel informs you that Sanson and Guydelot have succeeded in establishing their Bard unit, though there aren't any other Bards in it yet. Sanson asks you to assist in the unit's first outing even though you're more of a honorary member/friend of the group rather than an official member, and you head off together to receive your first orders from Commander Vorsaile. As it turns out, the Twin Adders got an anonymous letter about a tome that contains a damning secret about the Autumn War, and they want your unit to quietly investigate. Sanson wonders if the Twin Adders will try to suppress the unit's findings if it turns out the tome has information that casts Gridania in an unfavorable light, but the group is assured that they'll be properly recognized and compensated for their efforts.
You set out to meet the letter's sender, a man named Nourval who doesn't actually have the tome, but knows that it is somewhere in Gyr Abania. You journey to Castrum Oriens (where you actually spend the entirety of the Bard questline until the very end, any Bards that would have grinded to 70 during Raubhan EX wouldn't have been locked out of their quests at all) to start gathering intelligence on the journal. However, Guydelot quickly senses something amiss with Nourval, and essentially uses his drunkard bard persona to great effect as to not tip him off. Alliance patrols have been getting ambushed by masked bandits, to the point where Alliance members begin to suspect that there is a spy in the Castrum, and the two unit leaders note that the ambushes began upon the group's arrival. So they start watching Nourval more closely, until they make it seem as if they've become distracted by other duties. As suspected, Nourval takes this chance to leave, and the group follows him from a distance.
Nourval finds the tome with his 'masked bandit' friends, and reveals his intention to return to Gridania and spread word of what is written within - word of a crime committed during the Autumn War, the truth within likely to rekindle hatred for the Ala Mhigans, and undermine the Alliance's liberation efforts. Your group confronts him, and you defeat his group and retrieve the journal. The journal reveals what happened to Vainchelon, a Gridanian general in the Autumn War thought to have fallen in a great battle against the Ala Mhigans. The journal reveals that in reality, Vainchelon was invited to peace talks with the Ala Mhigan general, which turned out to be a trap. Vainchelon was poisoned and most of his group was slaughtered, save for his son, Gylbarde - the original owner of the journal. And Nourval is a descendant of the family line, who desires revenge against the Ala Mhigans by bringing the truth to light.
Sanson agonizes over what to do with the journal. He had his orders to bring the journal to the Adder's Nest as soon as it was found, but he knows the Adders will most likely just bury the truth. The group also doesn't believe Nourval to be beyond reproach, and decide the best course of action is to simply hold onto the journal until the contents within can actually be verified as the truth. They also figure there has to be some reason why Gylbarde never made this public knowledge. In the meantime, Sanson receives another letter from Nourval, inviting the player character alone to a meeting south of the Castrum, and the group decides to oblige since if it's a trap, it's not a very good one considering you're the strongest of the group. Surprise, it IS a trap, but not in the way the group was thinking - Nourval sought to get you out of the way, because the real target was Sanson, who received his own meeting request a short while afterwards and was then captured. Guydelot however still has the journal, and a ransom is demanded - Sanson's life for the journal. You and Guydelot retreat back to the Adder's Nest in Gridania to inform the Company of what has happened.
The Twin Adders insist that Guydelot hand over the journal, but he counters by saying that Sanson is his superior, and it wasn't his wish to hand it over to the Adders just yet. Later, a Serpent commander then informs you and Guydelot that the Adders have received news that Nourval's group has appeared in the South Shroud, and that Serpent command has decided all negotiations are off the table and Nourval is to be detained or killed on sight. Guydelot protests, knowing such an action condemns Sanson to death, and killing a descendant of Vainchelon on top of that is 'bullshite'. You protest as well, and as it turns out, the commander agrees - for the issue was never even brought up to the Elder Seedseer in the first place, for lower command never thought the matter to be serious enough to warrant her involvement. For that reason, the commander decides that a joint group consisting of himself, the leaders of the Archer's Guild and the Lancer's Guild (because Sanson is still a lancer at the end of the day), Jehantel, Guydelot, and yourself will set out to confront Nourval before the rest of command acts.
You and Guydelot set out first, and find Nourval and his associates holding Sanson hostage near the entrance to the Second Coil in the South Shroud. Guydelot tries to convince Nourval to stand down, but he doesn't have any of it and attacks. You and Guydelot handily defeat him, and he attempts to flee, only to be blocked off by the rest of the group just arriving. Jehantel asks Nourval to think about why Gylbarde never revealed exactly what happened afterwards, and that's because Vainchelon had a vision of peace. The truth, had it been revealed during the Autumn War, would have surely whipped the Gridanians of the time into a frenzy. It wouldn't have been enough to merely defend the Black Shroud from the Ala Mhigans, the people would have demanded blood, perhaps marching all the way into Gyr Abania. Such a thing would result in massive casualties for both sides, and would have run counter to Vainchelon's dying wishes. Nourval protests, saying that all his family desired for the past few decades was vengeance, but Jehantel disagrees. He KNOWS of Vainchelon and Gylbarde's wish, for he trained with Gylbarde long ago.
This convinces Nourval to relent, and Sanson alongside the rest of the group assures him that he won't let Serpent command bury the truth - that someday, the truth will come to light, in a future where it can be used to foster a greater understanding of peace rather than fueling more death and vengeance. Back at the Adder's Nest, the Serpent commander present lets Sanson know that in order for his intentions to be realized, he'll have to rise up in the ranks of Serpent command. The commander himself shares the same sentiments about the journal, and swears to support him and Guydelot. The questline ends with you meeting Jehantel back at his camp in the South Shroud, reminiscing about old days and the wish for peace through song.