I have read Alex Rider and I definitely recommend Alex Rider :Scorpia to ages 8+. It comes with lots of twists so you 100% will not get bored of it . My favourite part was when Alex prevents thousands of children from dying . It was written by Anthony Horowitz (a favourite). Alex was an ordinary teenage boy until he found out that his uncle was a spy and so he was sent on his first mission . This is Anthony Horowitz 5th novel of the Alex Rider series.