However, he has also said that Scorpia Rising marks the end of a particular chapter in Alex Rider's life. It sees him graduating from MI6 and embarking on a new path, which might indicate a shift in the series' focus.
It's likely that future books will explore this new chapter and possibly feature a more mature Alex Rider facing different challenges.
So while Scorpia Rising might mark the end of a certain phase in the series, it's definitely not the last book in the Alex Rider saga.