While looking in his father's shed for a rag to clean off his bike, Daniel finds a small, locked, wooden box. Now he is confronted with two mysteries: "What secret is hidden within the box?" and "Does the cry of the owl point the way to an even greater discovery?" With the help of his dog, Tango, Daniel is ready to tackle these mysteries. "Buscando un trapo en el cobertizo de su padre con el cual limpiar su bici, Daniel topa con una pequena caja de madera cerrada con llave. Ahora el se enfrenta a dos misterios: "Que secreto encierra la caja?" y "Llevara el canto de la lechuza a un descubrimiento aun mas grande?" Con la ayuda de su perro, Tango, Daniel esta preparado para enfrentarse a estos misterios."

Marta Jarque is an author of children's books, including Bet pierde la banda. Daniel Jiménez is an illustrator of children's books, including El cangrejo ermitaño and Daniel quiere ser detective.