Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
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!