Ben Aaronovitch is perhaps best known for his series of Peter Grant novels, which began with Rivers of London. Mixing police procedural with urban fantasy and London history, these novels, the latest of which is Lies Sleeping, have sold over a million copies worldwide. A new novella in the series, The October Man, will also be available soon.

Ben is also known for his TV writing, writing fan-favourite episodes of Doctor Who; 'Remembrance of the Daleks' - in which he originated the Counter-Measures characters who appear in this story - and 'Battlefield'. He wrote an episode of BBC hospital drama, Casualty, and contributed to cult SF show, Jupiter Moon.

Andrew Cartmel began a long and varied career in TV and publishing when he was hired as script editor on Doctor Who in 1986. He had a major (and very positive) impact on the final years of the original run of the TV show. He has recently completed a comedy for the London stage, Screwball, and is also writing the Vinyl Detective series of crime novels for Titan Books; the fourth, Flip Back, will be available soon. In his spare time, he likes to do stand-up comedy.