SECRETS PROJECT

Hi Guys, so for my English class i have to write an essay 500 - 1000 words about secrets, besides that im free to do what i want with the story. now i have alot of idea's but its just fitting it into 100 words because i have a habit of making even the shortest stories extremely long so im just going to think of a few ideas and go from there. i know i want it to be scary or a mystery but it has to have a shock or at least something unique about it. the idea's i have are all ideas of the actual secret, the rest of the story will just come naturally but its the actual secret i need to figure out, so my first idea and probably my favorite one is a pandora's box idea but with more of a twist to it but i dont know im just going to sleep on it but if you have suggestions about secrets i can put into the story tell me! haha