Help finding a comic book with Pepper Potts

So a while ago I found a comic featuring Pepper Potts. It was just a little like 'adventure' with Pepper potts, who gets trapped on a subway or something with some thieves who are trying to rob or take the subway passengers hostage or something. I can't find ANYTHING about it now, I switched computers and don't even have the title, but if anyone could help, I would super appreciate it!