City of Secrets

Natalie, a high school graduate that decided to go on a trip with her friends to Paris. She can't wait to explore and see the cites there.
She was walking down an alleyway, when someone tries to kidnap her. They were dragging her away when someone saved her from the kidnappers. She asked who it was by the wouldn't tell her. When he ran off she was left with his mask, with the initials S.I.
She finds out that S.I is a lot more dangerous to her than she thinks. Finding his secret, about her? But they just met, what could it be?