How can I come up with an original idea?

I have a school assignment where I have to write a story and my first idea was to write about a girl that was falsely imprisoned and her friend that’s majoring in pre law tries to help her get out. But it’s kind of tricky since I’m not completely well-versed on the criminal justice system. Any idea would be much... show more I have a school assignment where I have to write a story and my first idea was to write about a girl that was falsely imprisoned and her friend that’s majoring in pre law tries to help her get out. But it’s kind of tricky since I’m not completely well-versed on the criminal justice system. Any idea would be much appreciated.
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