Josh Lacey is the author of many books for children including The Island of Thieves, Bearkeeper, The Dragonsitter and the Grk series. He has worked as a journalist and written one book for adults, God is Brazilian. His first book for children, A Dog Called Grk, was shortlisted for the Branford Boase Award. Josh lives in London with his wife and daughters.

Beatriz Castro was born in La Rioja, Spain in 1985. When she was a little girl, she was always drawing and writing stories. She studied illustration at the school of arts in her home town, Logrono.

After graduating, she embarked on a career as a professional illustrator and has since been published by many international publishing houses. She especially enjoys creating funny characters.

Beatriz likes animals, classic stories and fairy tales and listens to rock and punk music.