Anthony Horowitz, OBE (born 5 April 1955) is an English novelist and screenwriter specialising in mystery and suspense. His work for young adult readers includes The Diamond Brothers series, the Alex Rider series, and The Power of Five series (aka The Gatekeepers). His work for adults includes the novel and play Mindgame (2001), and two Sherlock Holmes novels The House of Silk (2011) and Moriarty (2014).