Horowitz began his most famous and successful series in the new millennium with the Alex Rider novels. These books are about a 14-year-old boy becoming a spy, a member of the British Secret Service branch MI6. As of 2021, there are eleven books where Alex Rider is the protagonist, and another connected to the Alex Rider series: Stormbreaker (2000), Point Blanc (2001), Skeleton Key (2002), Eagle Strike (2003), Scorpia (2004) Ark Angel (2005), Snakehead (2007), Crocodile Tears (2009), Scorpia Rising (2011), plus Russian Roulette (2013). Horowitz had stated that Scorpia Rising was to be the last book in the Alex Rider series prior to writing Russian Roulette about the life of Yassen Gregorovich,Scorpia Rising Horowitz official site but he has returned to the series with Never Say Die (2017) and Nightshade (2020). In January 2022, he announced that he will begin writing a new Alex Rider novel that is due to be published sometime in 2023.
