As reported by the Boston Herald, here’s the basic plot of the new film:
Melissa McCarthy and Kristen Wiig will play unknown authors who publish a book asserting that ghosts are real. Their writing gains unwelcome attention a few years later, after Wiig lands a teaching position at Columbia University, and she’s soon laughed out of academia. The two later team with supernatural sleuths played by Kate McKinnon and Leslie Jones, and save the day when ghosts invade Manhattan.