If I read these books I could significantly improve my score on many challenges I've done previously, especially my favourite ones. And there's every reason to believe they'd help you achieve greater stardom as well.
Background: While I was doing yearly updates, these books appeared quite often on challenges where I had already scored well. So reading them should get me 5 stars & even quite near to the high achievers' scores.
Note: Because many of these books are general fiction, I think they will boost your score on a wide variety of challenges. There's also a fair number of classics, including modern ones, so you would likely improve your position in this most common category of challenges (while enjoying yourself, of course).