I would suggest the flaw is something within the hero, planted from some wound in his past, some inner issue which he has to rectify within himself before he can achieve his goal.

Think of Michael in The Godfather. Because his is a demise from a good character to a morally corrupt character we could say his flaw or weakness is he is legitimate, mainstream, separated from the family.

He must overcome these weaknesses to change and take action (revenge) to become a tyrannical ruler of the family.

In Tootsie his flaw is his he is arrogant, sexist, and a womanizer.

By becoming a woman and seeing things from a new perspective he is able to change and develop a real relationship with a woman.

So, the flaw must be how the hero starts the story, not something he must do in the future.

Read Truby’s sections on ‘Premise’ and ‘Character’ in his Anatomy of Story for more on this.

Ouch! Good work! Great premise ! BUT… out with the shears ! First, imply the genre, don’t state it outright. Treat it like a movie, give the audience clues – we love a puzzle, let us work stuff out.

“When Emily, a proud single mom, is locked in a car rigged with explosives, she must drive the car into the heart of New York or the kidnappers will execute her 5 year old twins.

(I think personalizing the word ‘family’ is always good). Is ‘pride’ her flaw ? Is that the negative quality she must conquer in order to achieve her goal and save her family ? if so, it’s the right adjective. If not, what is her flaw / wound / event from the past that is causing her all this grief ? Great work though! Nice one. Script written yet or just an idea ?