Two girls are ghost hunters. One of them has a friend who's working at a college. The fourth works for MTA, discovers the main ghost (who is a convicted murderer turned ghost by a freak electrical storm during his execution, I kid you not, and he can summon other ghost killers from throughout history or something) and presumably joins the team after that. The four girls have to come together to stop him. In addition to the main ghost, who if Feig gets his way will be played by Peter Dinklage, they will face opposition in the form of a professional paranormal "debunker" who thinks they're al full of **** after seeing videos of them catching ghosts on YouTube that, get this, Feig hopes will be played by Bill Murray. There won't be an Ecto 1. Their gear will be sleek and high-tech.