Elisabeth Brami was born in Warsaw. After graduating from studies in humanities and literature, she became a psychologist. She became an author for young people in 1990. Since then, she has not stopped writing and she has been translated into many languages. Estelle Billon Spagnol was born in France. After studying law, Billon-Spagnol entered the police force, but at the age of thirty she turned 180 degrees and has since published twenty books as an illustrator, author or both. She now lives, writes and draws in Paris.