Alex Gibney’s Going Clear: Scientology and the Prison of Belief is arguably the most hotly anticipated film premiering at the 2015 Sundance Film Festival.

HBO Documentary Films, which is releasing the eye-opening documentary on the Church of Scientology later this year, hired a team of 160 lawyers to look over the movie, and the church, despite not having seen it, took out a recent ad in The New York Times accusing Gibney’s film of being “a Rolling Stone/UVA redux.”

I just attended the first screening of Going Clear, which is based on the book of the same name by Lawrence Wright, and can report that it is a scathing exposé on Scientology and makes some startling accusations about its most famous member, Tom Cruise.