About the Author

Angels Navarro is a former psychologist and the author of a series of school notebooks and numerous children's books. Her work focuses on brain teasers and logic puzzles in various formats. She is the author of, among many other books, Animalario; Buenas noches; Letra a letra; Mira, mira; El tesoro de Barbazul; Vamos de fiesta; and the Cuando era . . . series. Aina Cordoncillo is a designer and illustrator specializing in children's books. She is the illustrator of Helena y la amistad and El tiempo.