Jeffrey Epstein’s “sex scheduler” wants to write a tell-all memoir, Page Six has learned — but she fears giving away her “get out of jail free” card.

Sarah Kellen began working as the late pedophile’s assistant in 2001 and worked for him for about 15 years.

She also worked closely with his girlfriend, convicted sex trafficker Ghislaine Maxwell.

Kellen has been framed as both his co­conspirator and his victim.

And now we hear she wants to tell her story.

“She has so much to say, to plead her case. What she knows [about Epstein and Maxwell] would shock the world,” a confidant of the former couple told us of Kellen.

“One day she will write a tell-all book or produce a documentary for a Netflix type or give a tell-all to a TV show. But the info she has is her ‘get out of jail free’ card. It’s more valuable for her to hold onto the information should she need it to stay free.”

Kellen was named as an unindicted co-conspirator in Epstein’s infamous 2007 case that saw him receive a lenient sentence in Florida.

She has never been prosecuted. Testifying before the House of Representatives earlier this month, she said, “I was trapped inside Jeffrey Epstein’s world . . . He groomed me, sexually and psychologically abused me, controlled me, manipulated me, dominated me, and gaslit me until I could no longer tell which thoughts were mine and which were his.”

“Her book or show could go for millions,” said our insider.

“She had a front-row seat to the debauchery. But the price for freedom is priceless.”

Kellen “accelerated her interest [in writing the book] after Epstein’s death,” the source added.

“She didn’t want to do anything while he was alive. She still fears Ghislaine Maxwell. But she won’t go to the grave with this story. It will come out either in court or tell-all form. There will come a time.”

Kellen’s attorney didn’t get back to us.