So far I've managed to scrape past most puzzles but i cant find a way to unlock the study room in Maradino's lair, I've heard people say enter the library and read the book "book", but i haven't found any library or any books around. The switches in the garden don't seem to have an effect either.
So does anyone know where I need to go to find the library?
Edit: Solved!
There's a hole in the gardens you need to dig up by the shovel.