Ahead of its 20th anniversary early next year, the author Kate Mosse talks to Harriett Gilbert and readers from around the world, about her globally bestselling novel, Labyrinth.

It’s a historical thriller set between medieval and contemporary France where the lives of two women, living centuries apart, are linked in a common destiny. In 13th century Carcassonne, seventeen-year-old Alaïs is given a mysterious book by her father which he claims contains the secret of the Grail. While 700 years later, archaeologist Dr Alice Tanner discovers two skeletons in a forgotten cave in the French Pyrenees and sets out to investigate their origin.