Sofía Rhei (Madrid, 1978) is a writer and poet and has published over 40 books. Her most famous stories for young readers are El joven Moriarty, Cómo tener ideas and Flores de sombra. For adults she has written the novels Espérame en la última página, Róndola and Newropía. She has received several awards, including the ESFS Spirit of Dedication Award, has been recognized by Venezuela’s Banco del Libro and has been included in the White Raven catalogue for her children’s work. She has also been awarded with the Celsius, Kelvin and Dwarf Stars prizes for her adult writing.

Marian Womack is the first Spanish author to graduate from the Clarion Science-Fiction and Fantasy Writers’ Workshop. In Spanish she has published Memoria de la nieve (Tropo, 2011), and alongside Sofía Rhei she has written La calle Andersen (La Galera, 2014), a follow up to Hans Christian Andersen’s The Snow Queen. In English she has published the novels The Golden Key (Titan Books, 2020), a detective story with supernatural elements; The Swimmers (Titan Books, 2021), a climate fiction story; and the short story collection Lost Objects (Luna Press, 2018). She lives in the United Kingdom and works as a librarian at Cambridge University. Her next novel is a sequel to The Golden Key, titled The Silver Bell (Titan Books, 2022).