Anthony John Horowitz (born 5 April 1955) is an English novelist and screenwriter specialising in mystery and suspense. His works for children and young adult readers include the Alex Rider series featuring a 14-year-old British boy who spies for MI6, The Power of Five series (known as The Gatekeepers in the US), and The Diamond Brothers series.

Horowitz's works for adults include: the play Mindgame (2001); two …