Sin City director Robert Rodriguez has confirmed there will be more film adaptations of Frank Miller's graphic novels - they will be shot back to back next year.

The maverick film-maker is so pleased with the standard of the critically acclaimed first movie, he now feels comfortable with developing the characters in the future projects.

He says, "We'll do another one. Hell, we've got enough books."

"One bad movie would have ruined the novels. I'd never have been able to touch them again."

"Now I can go back and work on the characters."