library - Hints
Did you notice some of the books move? Following the “Secrets of Deception,” there is both true and false information on these books and you’ll need to be able to distinguish what you need.
Tilting the books reveals letters.
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Tilt all the books back into their upright position and find the books by Agatha Christie. Tilting out just the Agatha Christie books gets you the information you need: Mustard is deathly allergic to roses.