Don’t say we told you this because nobody’s supposed to know. But we’ve got some of the details of the super-secret script for the “Ghostbusters” reboot that starts filming in Boston this week.

As you know, the all-gal ghostbusters in the new flick are played by Melissa McCarthy, Kristen Wiig, Kate McKinnon, and Leslie Jones and according to our script spies, Wiig and McCarthy play a pair of unheralded authors who write a book positing that ghosts are real. Flash forward a few years and Wiig lands a prestigious teaching position at Columbia U. (Like the original, the story takes place in New York City, even though it’s being shot in Boston.) Which is pretty sweet, until her book resurfaces and she is laughed out of academia.

Wiig reunites with McCarthy and the other two proton pack-packing phantom wranglers, and she gets some sweet revenge when ghosts invade Manhattan and she and her team have to save the world.

Word is, the script has gone through a slew of revisions. And may still be getting tweaked even as director Paul Feig gets ready to shout “Roll ’em.”

We can reliably report that the icky apparition Slimer will return in the reboot. Still up in the air, though, are cameo appearances by original ghostbusters Dan Aykroyd and Bill Murray.

“They are negotiating,” said our spy. “But, of course, no one can get ahold of Murray.” (Dr. Peter Venkman does not have a lawyer or agent, just a 1-800 number that may, or may not, get a message to him.)

We also hear that filmmakers plan to shut down a section of the financial district for three nights while filming an epic ghost invasion of Manhattan. Still no word on whether the Stay Puft Marshmallow Man will make a reappearance. But do stay tuned. …

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