Rooney Mara stars as Lisbeth Salander in Columbia Pictures' "The Girl with the Dragon Tattoo." (Merrick Morton)

Norstedts, the late author’s publisher, has created an app that follows the story of Lisbeth Salander, the computer whiz readers have followed through three books and the Swedish and American movies.

Chasing Salander-The Girl with the Dragon Tattoo” is available in English. New scenes were shot by Pieter ten Hoopen with the narration by Shanti Roney.

Warning-you have to be 17 to down load this app. And if you are wondering why, you haven’t read the books or seen the movies.