At the first large area with enemies behind building there is roof of other one berried in snow, the grim is in barrel near it.
In next segment of open area there are 2 paths separeted by cliff it would be faster to drop on right side for 1st tome.
Going up from lover area with 2nd tome you will see 2nd grim, just jump somewhere close to it and take it mid jump.
After cave area there will be two subsequent dropdowns you drop only one time, there is tome behind tree.
After dropdown from 2 tome there will be doors to ur left. Tome is behind 3rd one.