Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Stories with unexpected twists that lead to solving crimes. One solution comes about through a ten-year old doing his homework, the second story is a murder that results from a huge mistake, and the last story is solved by an assignment written on a blackboard in a classroom.