Why the appeal of "The Girl...?

I just finished reading "The Girl Who Played with Fire," and began to wonder why I, and so many others, like these books. I think it's Liz Salander's ability to read other people's computers and to delve into the data that accumulates on all of us. In this cyberage, she is the equivalent of a flying Superman with X-ray vision in a physical age. She can go anywhere and find out what anybody is doing and thinking. We are happy to go with her.