The door is locked, but of course you've found that out by now.
Go back to the hall, turn left and follow the path upstairs. There's a fairly tough fight up ahead, but if you make it, you'll find a bizarre key in a bookcase. Now you can open Garrinol's door.
Good luck.
Edit: Sorry, i guess i didn't read your post all that well. You need a scroll of Spirit's Touch to identify objects. You'll find them randomly in the game, but if you don't have one at the moment you can always go back to the Gipsy woman's shop and buy one. I recommend you add that discipline to your spellbook as soon as possible.