Melanie Frances specialises in developing interactive stories featuring games and puzzles. She is joint artistic director of interactive digital arts organisation Produced Moon, with whom she has created a range of immersive and interactive experiences, including escape rooms and app-based audio adventures.

Charles Phillips is the author of more than 40 books, whose How to Think puzzle series sold more than a million copies and was translated into 18 languages. He was the editor of Biographic: Sherlock (Ammonite Press, 2018). Together, they have written three Sherlock Holmes puzzle books, The Adventure of the British Museum (Ammonite Press, 2020), The Adventure of the Analytical Engine (Ammonite Press, 2022) and The Adventure of the Tower of London (Ammonite Press, 2022).