El misterio de la biblioteca secreta (Hermanas Coscorrón. Agencia de investigación)

The director of the Talking Library is very worried because a large number of books, films, and magazines have been disappearing lately… Who's behind it all? Luckily, the Coscorrón Sisters have joined the library's book clubs and can contribute their investigative skills to try and solve the case. Will they manage to catch the culprits? And even more: will Marcelo discover what his favorite author is up to when he vanishes behind some bookshelves?