I just want to remind new players that the official walkthrough you find in the first post is a very very very very very very useful tool, a comprehensive and complete game walkthrough and a basic strategy guide too.
Basically, every question I saw in the last 350 pages is easily and clearly answered in the walkthrough,
except these 5 questions:
1) how MC hides in the bookshelf in the library/office in order to spy Baron Giron & Idiot Dave while they're having conversations - how it works;
2) where the damn is the cave when you follow Liandra's kidnappers;
3) how many times you have to beat Syfa before she drops that fucking damn key;
4) the exact spot where you must hide in order to listen to the conversation between Kate and Thomas at midnight;
5) how the 3rd magic puzzle in Gwen's quest works.
If you need these answers just use the search bar in the upper right corner of the site.
Capito?