Anthony John Horowitz 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, and The Diamond Brothers series.

Alex Rider is a series of spy novels by the English author Anthony Horowitz. The novels revolve around a teenage spy named Alex Rider and is primarily aimed towards young adults. The series currently comprises 14 novels, as well as six graphic novels, seven short stories, and a supplementary book.