Well, there's one thing I as a player am uncertain about. Tailen has been described as "fair". But if she's got a horrible temper, it doesn't matter how fair she can be when she's angry.
The library is not necessary by any stretch. She just needs some writing tools and parchment. She can also hide the document in pretty much any place she knows it will be found eventually, and that she can describe without any risk of misunderstanding to the recipient.
Lucan had only the knowledge the group possessed before they met the fake Nymeria. I believe Fortune has more knowledge about this now than he did, but not necessarily enough to make up for it.
Instead of proceeding with the plan immediately, she will start out by discreetly ask about Lucan, and if he is still alive, seek him out.
By the way, the reason I did not react more to Lucan being taken was to allow a smoother transition between players. That is, I as a player has the metaknowledge that Lucan needed to be removed from the group somehow. Making a big fuss over it seems to only accomplish one goal: Making the GM's life slightly harder. With that said, I do realize that it's not exactly fantastic roleplaying on our part. Fortunately, we had not exactly gotten intimate with him yet.