No, grpahic novels are usually new stories. Look at the so called GN Master- Frank Miller.
Dark Knight Returns
The Dark Knight Strikes Back
300
Sin City
Sin City, 300, and Batman begins are either based on or take elements from the graphic novels.
Knowledge is Power, Power Corrupts, and Corruption Destroys.
Life is pleasant. Death is peaceful. It's the transition that's troublesome.
~Isaac Asimov
There was never a good war, or a bad peace.
~Benjamin Franklin
You can kill a man but you can't kill an idea.
~Medgar Evers
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