Ark Angel by Anthony Horowitz

Alex is still recovering from the sniper shot (in scorpia). When he is in the hospital, four people enter, and Alex disarms them. Before he can call the police, a fifth man enters and knocks him out. When he wakes up, he is held hostage of Force Three, an organization for which the people he knocked out worked. Kaspar, the head of Force Three, leaves Alex to die, but he manages to escape. Drevin, an enemy of Force Three, calls Alex to thank him. Joe Byrne director of the CIA phones Alex telling him Drevin is the biggest criminal in the world. Alex's cover is blown up. He is caught again and brought to a hangar. Drevin launches a missile to Ark Angel, a space hotel he was building. Drevin tries to escape on a seaplane, but he crashes and dies. MI6 sends Alex into space to move the missile. He moves it and lands in the coast of Australia.