I solved the riddle, the little cutscene plays (Adriana plays the guitar, talks to her brother about the papers etc.) and then I am back in the dining room. And after that I'm kinda stuck, because I haven't found a way to progress any further.
OK then could you please send me the save? there are numbered files corresponding to each save game slot and pages, so page 1 slot 5 is 1-5-LT1.save, page 2 slot 3 is 2-3-LT1.save, and so on.
You can find the saves in the "game/saves" subfolder in the installation directory
You can email them to me directly at 