Help open the chest near Ferlund village under the waterfall (The Witcher 3: Wild Hunt)

I vaguely remember that there will be a key on the quest, I probably passed there at the beginning of summer

Esthetix
on which quest the game was played 3 times and so this chest did not open

Roma Ilchenko
Some bandit (I don't remember where) has a key and a treasure map. Climb the bandit camps

ArsenyPestr
already all the camps and in general everything that can be seen has been cleared

Roma Ilchenko
can not be steamed there hunting boots and a small glyph for freezing

miha890
so the key is where

Roma Ilchenko
Yes, there is not a key, but a book, you need to read it, it’s like a quest is considered, but I don’t remember where I found it anymore)