HI guys, I am making a new horror game "subway Z"  that everything happen in a subway

here is the screenshots 

i hava problem with scenario, until now the scenario start a man in train and read newspaper, suddenly the lights going off for two second and back, when the lights on, people in train all disappear and... i would be happy if anyone give a scenario to help this project

the game is in first person and gameplay about 10 to 15 mins