So, I just completed, or am in the process of completing Royal Fox Hunt in the Siege of Paris dlc. I just spoke with Charles in the Amphitheater and decided to explore a bit around town, so Amiens (I haven't touched Fire From Heaven yet).
I came across an empty tavern called the Slaughtered Calf Tavern and found a note inside called: "Orders from Odo".
The last time I spoke to Odo he said there will never be peace for Northerners in both Francia and England, and that he will not budge. But suddenly this note talks about his "trusted ally" Eivor, and that the Captain must place someone in my care. The note itself doesn't make sense in this point of the story (I guess it's related to a later story mission), but it does spoiler the story a bit. Now I know Eivor and Odo will patch up, and work together, even though there were not hints at all yet towards that at this point during the storyline.
Maybe make it so that this note only appears after a certain point in the story? From the mission it's related to and onwards for example.