David Miscavige’s niece is writing tell-all memoir about Scientology. The book describes Jenna Miscavige Hill’s experiences growing up in the church, which some claim is more of a cult than a religious group. The 28-year-old author maintains she witnessed both physical and mental abuse while growing up in the church which boasts Tom Cruise as a member. The book is rumored to include details about Scientology’s upper ranks.

Jenna is the daughter of the church leader’s brother, Ron. She had been a fairly public critic of the organization since she broke away from the religion in 2005. Beyond Belief: My Secret Life Inside Scientology and My Harrowing Escape will reveal “strange and disturbing” information about what life was like growing up inside the church, according to publisher comments shared on the Daily Mail. The book will be released in January, according to the Denver Post.

Jenna Miscavige Hill had this to say about her tell-all book:

“If you flunked your uniform inspection, sometimes if you were late, you would be dumped with a five-gallon bucket of ice water. We were also required to write down all transgressions, similar to a sin in the Catholic religion. After writing them all down, we would receive a meter check on the Electropsychometer to make sure we weren’t hiding anything, and you would have to keep writing until you came up clean. This is from the age of 5 until I was 12. I was allowed to see my parents only once a week at best, sometimes not for years.”

After turning 16 in 2000, the young woman’s parents allegedly became disillusioned with Scientology practices and left the church. Jenna later joined forced with fellow ex-Scientologists, Astra Woodcraft and Kendra Wiseman. The trio of women founded the Exscientologykids.Com website. The goal of the website was to create a non-judgmental support group for those who are still involved with the church, as well as a place for discussion and debate for those who have already left the religion.