Much of Virginia Giuffre's story has been heard before but in her memoir, published posthumously, the abuse is described in appalling detail.
Two days ahead of the book's official publication, the BBC got hold of a copy.
There are revelations about Ms Giuffre's encounters with convicted sex offender Jeffrey Epstein and his former girlfriend Ghislaine Maxwell - as well as more details of her allegations about Prince Andrew, which he has always denied.
Here's what we learned from the 367-page-long book.
Prince Andrew allegations - and an 'orgy'
In the memoir, Ms Giuffre says she had sex with Prince Andrew on three separate occasions.
The third time, she says, was on Epstein's island as part of what Ms Giuffre called an orgy.
Epstein, Andy, and approximately eight other young girls and I had sex together, she says.
The other girls all appeared to be under the age of 18 and didn't really speak English. Epstein laughed about how they couldn't really communicate, saying they are the easiest girls to get along with.
She later recalls seeing the photo of Epstein walking in New York's central park with Prince Andrew, published in newspapers around the world in 2011.
I was of course revolted to see two of my abusers together, out for a stroll, she writes.
But mostly I was amazed that a member of the Royal Family would be stupid enough to appear in public with Epstein.
Prince Andrew, who reached a financial settlement with Ms Giuffre in 2022, has repeatedly denied any wrongdoing.
'Epstein told me I'd had a miscarriage'
Shortly after the alleged orgy Ms Giuffre says she wasn't in great shape, and had irregular bleeding and a tenderness in her abdomen.
She says Epstein took her to a hospital, where she remembers being taken to an examination room. However, she says she is unclear what happened next due to pain medication affecting her memory.
Soon after, she writes, one of the other girls in Epstein's house suggested to her that an incision mark near her belly button could mean she had surgery for an ectopic pregnancy.
But Epstein told me I'd suffered a miscarriage, which is altogether something different, Ms Giuffre says.
Epstein never wore a condom. Neither did the men he and Maxwell trafficked me to.
Memories of Epstein 'torture' Giuffre
At the centre of the abuse was the late Epstein and his former girlfriend Maxwell, who is currently serving a 20-year sentence on sex-trafficking charges.
Ms Giuffre says that even after many years, the memories of what Epstein put her through torture her - and says she feared she might die a sex slave at the hands of Epstein and his circle.
The memoir includes shocking descriptions of sadomasochistic sex.
She says Epstein developed an interest in it over time, and began to experiment with whips and restraints and other instruments of torture.
In session after session, he would play out various fantasies, with me as the victim, she writes.
Ms Giuffre details the physical effects such abuse had on her body, noting dark circles under her eyes and visible ribs.
Maxwell's part in the abuse
Ms Giuffre goes into detail about how she first met Maxwell, and how she introduced her to Epstein.
She recalls Maxwell's arrival at the Mar-a-Lago spa, where a teenage Giuffre was working, and how it led to her first introduction to Epstein.
Disappointment at Epstein's death
One of the other themes running through the book is Ms Giuffre's desire for accountability, expressing disappointment at Epstein's death in 2019 while awaiting trial on sex trafficking charges.
Ms Giuffre recounts her hope that both Epstein and Prince Andrew will be held accountable for their actions.
The memoir concludes with Giuffre's poignant declaration of hope for helping others with her story.
