The Secret Chapter
Das tödliche Wort
The Mortal Word
La città segreta
Das dunkle Archiv
The Lost Plot
La biblioteca invisibile
La città segreta: Biblioteca invisibile 2
Das tödliche Wort: Die unsichtbare Bibliothek 5
The Lost Plot: The Invisible Library, Book 4 (Unabridged)
The Mortal Word: The Invisible Library, Book 5 (Unabridged)
