Fabrice Mazza is a puzzle setter based in France. He has written numerous puzzle books. Sylvain Lhullier is a puzzle setter based in France.

The Book of Riddles contains more than 100 superb puzzles that are guaranteed to get your brain spinning and your mind whirring. All are set in the olden days, and Merlin the Magician, Avalon, King Arthur and other mythical people and places feature prominently. And that's what makes this book special; it's not just 'another puzzle book'. It is a superbly crafted, unique piece of publishing that brings joy as soon as it is picked up. The fonts, the paper, the design, the page decoration, even the language used - everything has been carefully planned and executed.