Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Two twins live near the beach. When they go exploring, they find tiny bubbles of sand forming patterns all over the beach. Where did they come from? What causes them? They find a surprising answer.