If you try to enter before unlocking it, you will get the message:
You try to enter the Haunted Library, but the door is locked. I guess this particular information doesn't want to be free.
To unlock the library, you must first find the Spookyraven library key. Once you have entered, be sure to browse the stacks – the library has books catering to every... taste.
If your main stat isn't high enough, you will see the following message:
As you get near the library, you start thinking about all of the times you've been hurt because of libraries. Like the time that librarian broke your knees because you couldn't pay your overdue book fines, and the time that you tripped over a drawer that had been left open in the card catalog and got a black eye.
Maybe you should come back when you're a little tougher, so that you don't get hurt again.
(You must have at least 40 <Stat> to adventure here.)
Note: Clicking the third book from the left on the top shelf consumes one adventure. If this is the first time this ascension you have done this, it will grant access to the second floor.
Read "To Serve Man... Delicious Cocktails": Get a random cocktailcrafting recipe.
Read "Ancient Forbidden Unspeakable Yoga, a Beginner's Guide":: You lose 10-15 HP (Spooky damage) and gain <mainstat>±4 in Fortitude, capped at 75.
Reading is for losers: Leave, no adventure loss.
Note: Clicking the third book from the left on the top shelf consumes one adventure. If this is the first time this ascension you have done this, it will grant access to the second floor.
Information wants to be free is something of a slogan used by many (sometimes opposed) groups, including parts of the free content movement, the technological elite, anarchists, crackers, and parts of the sci-fi subculture.