Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Strange notes keep appearing in Classroom 5B, and nobody knows who’s leaving them. Emily, Zoya, Joseph, Ash, and Jhone team up to solve the puzzle. But the more they investigate, the bigger the mystery grows... and the whole class might be part of the secret!