Find a book quest - where is it?

[Momacel]

The medic in the Citadel sends you looking for his book saying that the imps he send to the arena to clean the cages might have it (you have to ask a second time for that piece of information). Larian commented something a discussion back in 2017 saying the book is the spider's cage in the arena. i don't understand where that arena is and am frustrated, i went to all the cages i saw along the way, even in the place with the giant hole where a spider fight took place, even in the cages at the star of the game. (it's been more than an hour and i can't get on with my story - i don't know how and finding this books seems mandatory). What i do know is that after this you unlock alchemy and that is very important (plus i dont use battlefields)

[Momacel]

I spoke to the arena guard on the second bloody day. The arena must be the one with the pit in the middle. I still cant find the book. All the rooms around that area are opened and cleaned out so the silver key from the medic is useless. Thing is i had a bug or smh at that moment in time and a ghost that should have come out of a room just stopped existing after a few quicksaves. I never killed it since in the newest save there was no ghost, i thought it was fine, that maybe i had played in such a way that there was no need for a ghost or smh like that. Might the problem be related to that?

[Momacel]

Found it after way too much time thanks to this site https://www.gamebanshee.com/beyonddivinity/walkthrough/prison1.php
Not happy about this mission that thing was invisible and holding ALT useless. Also the key did NOTHING relating to this quest

[braithy]

Found the book, killed the ghosts but won't allow me to pick up the book per se. Every time I go back to Tully it prompts for him to tell me the task again as if I have not completed it. Not sure what I am doing wrong as I thought once you click on a book it is effectively inventorised.

[Momacel]

Try to drag and drop the book in your inventory. When it comes to books and manuscripts, if you want to keep them, you usually have to drag them into the inventory window (since only clicking such an item prompts the text that it contains). This, however, i believe is not true for spell books (clicking on a spell book first adds it to your inventory, clicking on it whilst it's in your inventory will make your character learn some skills).

The book for this mission is extremely hidden by that pile of hay and pressing ALT to see it won't help (as far as i remember)., but you can still see a little gray corner poking out of the hay. You can drag the book from that little corner into your inventory. Once you have it go back to the infirmary and talk to the doctor.

Also, I found out that the ghosts have nothing to do with this quest (in fact they aren't related to any quest you can just sneak past them as far as the game is concerned).

This is a pretty annoying side quest because you are literally told about something that is hard to find but would help you in your journey, unlike the many spaces with items and characters that are more or less hidden but at least have the decency to let you blindly walk past them without burdening your gamer conscience.

[Momacel]

@braithy