Anthony Horowitz has written several short stories, all considered canon in the . These stories have been printed in British newspapers and have appeared on the internet, the first being published in 2003. As well as these, Horowitz has also written additional chapters for his books, such as "Resistance to Interrogation" (Stormbreaker) and "Coda" (Snakehead). The extra Stormbreaker chapter can be found here while the extra Snakehead chapter can be downloaded from here.