Enter the boy Yann Margoza, destined to be a hero; Tetu the dwarf, his friend and mentor; Sido, unloved daughter of a foolish Marquis; and Count Kalliovski, Grand Master of a secret society, who has half the aristocracy in thrall to him.

Written with Sally Gardner's characteristic vividness and passion, these are two thrilling tales of secrets, murder, revenge and romance, set against the vivid historical background of the French Revolution.

There are 704 pages in this book. This book was published 2012 by Hachette Children's Group .

Her website is www. sallygardner. net and you can follow her on Twitter @TheSallyGardner