Alex Rider is a series of spy books. It is written by British author Anthony Horowitz. The series is about a teenage spy named Alex Rider. The series is aimed at young adults. There are ten books in the series, but short stories and other books have been published too. The novels are published by Walker Books in the United Kingdom. The first novel, "Stormbreaker", was published in the United Kingdom on 4 September 2000 and was adapted into a movie in 2006. Over 10 million books in the Alex Rider series have been sold worldwide.