What is the primary setting for stormbreaker?

The primary setting of "Stormbreaker," the first book in the Alex Rider series by Anthony Horowitz, is London, England. The story begins with Alex's life as a typical teenager, but it quickly shifts to various locations around the city as he becomes embroiled in a secret mission for MI6. Key locations include his school and the high-tech facilities associated with the spy agency, as well as the fictional Stormbreaker facility, which plays a central role in the plot. These settings contribute to the thrilling and adventurous atmosphere of the novel.