We've got round to episode 3, and there are 2 Investigators who are heavily injured (down to last HP for 1), so they will be held at Mr Abelard's pleasure for some weeks to come. Of course, there are the NPCs to interact with, but there is a large room put aside just for a library by Mr Abelard. Knowing his research preferences, there will of course be large sections for geology, chemistry and engineering, however apart from his Diary, did you gusy put in any other mythos/occult tomes?
I have no issue with giving Investigators access to tomes, as in reality, when they pass a mythos check with a skill less than 10%, they deserve all the information they can get on what is about to eat them! And this seems like a great period of down time for them to get in some light reading.
FYI, in this game, the players pre-warned Dr Armitage about the possibility of an attack, so the mythos books from the Orne library are safe in his possession, and have not been repossessed by FOC investigators.