This is by far the shortest day. Just a couple of puzzles, and we are done.

Take the key that has appeared and use it on the locked door to enter Wolfgang's library. Take a look at any of the books that you like, and when you are ready to proceed, use the gears icon on the coat of arms hanging on the left wall. You will need to shuffle the pieces into place to make a coherent image. Each square can be switched with any other; they don't have to be adjacent. I would recommend starting with the center of the shield and working your way out from there. Can't be any easier than that. Once done, a hidden passage will open up in the wall.

The passage will lead to the Schattenjager trophy room. I would be as excited as Gabriel. In the center display is a book on Benin. Take this to read it. It will recommend a book called "Primal Ones". Exit this screen and go back to the library. Now use the Gears icon on the Sociology Books (remember, you can use space to display where all the book types are) to find and read "Primal Ones". It will recommend another book called "Ancient Roots of Africa", so now click on the historical books. This will in turn recommend a book called "Sun Worshipers", so read the religious books next. Next, read the archaeology books for "Ancient Digs of Africa".

Head downstairs and talk to Gerde. Choose "snake mound book", and then give her the Americans Repressed card. Head to Africa to end the day.