Please note: All credit goes to Combine00!
Tomes and grims for Trails of Treachery DLC.
Guide to Grims and Tomes
Area just before freeing sleigh, just after sending crate away (Area where you let crate go down the rope on the left of first image).
Just after freeing sleigh, grab key and head behind the tower. Bonfire to the left of grim too.
Just after the first time you lose sleigh, after using draw bridge. The fence that breaks if near the tip of the billhook.
Cog wheel area, you can drop from the ledge and grab the tome from below by spamming interact and jumping at it.
Second Grim a little before final event. Not always there; spawns if path takes you right at the cog event.