Story Idea: "Rosemary's Intern"

The story of a young woman who gets a job right out of college in a small but incredibly popular young internet company. She soon realizes that the company is actually a demonic cult trying to take over the world in the name of Satan. Can she save her boyfriend and escape this secret society before it's too late?

...yeah, I know it's cheesy. But I bet would burn up the Christian fiction market (no pun intended).