The dark and shocking conclusion to the number one bestselling Alex Rider series. The dark and shocking conclusion to the number one bestselling Alex Rider series. In the final book in the number one bestselling Alex Rider series by Anthony Horowitz, Alex is trying to get his life back on track. But Scorpia has returned, and when you're the world's most successful spy, the only way out is to face your enemies. Alex's final mission will be the deadliest of all.