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How do you develop an idea for a novel?

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I have somewhat thought of an idea for a novel...a girl's parents go on a trip and never some back. 5 years later the girl is invited to go to an academy in new york where she meets 2 students who have gone through similiar situations. Now the 3 of them work together to find out what really happened and discover a world full of secrets...that os a quick summary of my idea but I don't have all of the ideas such as what actually happened to the girl's parents. I need help on how to develop my idea so I can actually write a novel. Criticism is welcome.