William Sutcliffe is the bestselling author of numerous books, including the international hit Are You Experienced?. The Wall, his first YA novel was been shortlisted for the Guardian Fiction Prize and Carnegie Medal. Circus of Thieves is his series for younger children. He currently lives in Edinburgh.

David Tazzyman grew up in Leicester, studied illustration at Manchester Metropolitan University, and then travelled around Asia for three years before moving to London in 1997. He likes football, cricket, biscuits, music, and drawing. He dislikes celery.