About the Author

Christian Friedrich

Cally Stronk and Christian Friedrich live in Berlin, where they develop stories for children and young people together. Cally has already published over 30 books with German and international publishers. In 2019, she was awarded the Preuschhof Prize for Children's Literature.
Christian also writes books and, as a qualified cultural scientist, produced and hosted his own political satire show for the Hildesheimer Allgemeine Zeitung for many years. Together, they are now embarking on the mission "The Mad Professor" in the name of "The Three Investigators".