There are several differences. In the graphic novel, the backstory of the main character is explored in much more depth, with more flashbacks and internal monologues. The movie, on the other hand, focuses more on the present - day action and mystery. The graphic novel also has a more complex web of secondary characters, each with their own detailed backstories and motives. In the movie, some of these secondary characters are combined or their roles are reduced to keep the focus on the main plot. Additionally, the visual style of the movie is different from the graphic novel. The movie uses a more modern, cinematic color palette and camera angles, while the graphic novel has its own unique art style that gives a different feel to the story.