in London and other locations. So far, starting with The Word is Murder, four of these books have appeared, with three others commissioned. In 2011, Horowitz tweeted that he had plans to write a new trilogy for the same demographic as his Alex Rider and Power of Five books, but that it's still "a secret". During 2012 and 2013, Horowitz tweeted out some more information regarding the series, where he stated that it will be "a completely new genre" from anything else he'd done so far, and that it will have a contemporary setting in modern-day London with a 15-year-old protagonist. He also revealed that it's tentatively entitled The Machine. However, Horowitz revealed in 2021 that he has yet to begin writing this series and that he has no immediate plans to do so. Film and television career Film Horowitz wrote the screenplay for Just Ask for Diamond, a 1989 film adaptation of his Diamond Brothers novel The Falcon's Malteser that had an all-star cast which included Bill Paterson, Jimmy Nail, Roy Kinnear, Susannah York, Michael Robbins and Patricia Hodge, and featured Colin Dale and Dursley McLinden as Nick and Tim Diamond respectively. Horowitz is the writer of a feature film screenplay, The Gathering, which was released in 2003 and starred Christina Ricci. He wrote the screenplay for Alex Rider's first major motion picture, Stormbreaker. Television Horowitz began writing for television in the 1980s, contributing to the children's anthology series Dramarama, and also writing five episodes of the third season for the popular fantasy series Robin of Sherwood. He also novelised three of Carpenter's episodes as a children's book under the title Robin of Sherwood: The Hooded Man (1986). In addition, he created Crossbow (1987), a half-hour action adventure series loosely based on William Tell. This era in Horowitz's career also saw the release of Adventurer (1987), a thriller about a convict stuck on a prisoner ship with his sworn enemy based on the Richard Carpenter series, and Starting Out (1990), a collection of screenplays by the author himself, published. His association with murder mysteries began with the adaptation of several Hercule Poirot stories for ITV's popular Agatha Christie's Poirot series during the 1990s. Often his work has a comic edge, such as with the comic murder anthology Murder Most Horrid (BBC Two, 1991) and the comedy-drama The Last Englishman (1995), starring Jim Broadbent. In 1991, The Diamond Brothers, a