Daniel Hernández Chambers (Santa Cruz de Tenerife, 1972) published his first novel, La ciudad gris, in 2006, which was followed by El enigma Rosenthal one year later, thus giving way to a successful career as a writer of young adult fiction. In 2012 he won the Premio Everest Juvenil with Un fragment de noche en un frasco, novel which was followed by the adventure series for children Chelo Holmes, detective privado and La clase Monster class, and the dystopic tetralogy for young readers Olkrann. His last two books are Las aventuras de Alonso y Sancho and El secreto de Enola, which was granted the Premio Ala Delta Edelvives 2016.