The tell-all book about the Church of Scientology Going Clear has reportedly been made into a HBO documentary that could premiere as soon as the Sundance Film Festival in January. According to The Hollywood Reporter, Oscar-winning director Alex Gibney is directing the film, which will "feature new revelations about the controversial religion and its famous followers Tom Cruise and John Travolta."

The documentary will likely live among HBO's more controversial ones, like The Case Against 8 and Mea Maxima Culpa: Silence in the House of God (which Gibney directed). Gibney won his Oscar for helming the critically acclaimed documentary Taxi to the Dark Side for HBO in 2007, and was also the director of 2005's Enron: The Smartest Guys in the Room.

The book came to fruition after the bombshell New Yorker profile of Hollywood filmmaker Paul Haggis, who defected from Scientology in 2011. It's also one of the most highest-profile looks to date into the secretive organization. At the time it was published it caused such a stir that it provoked the Church of Scientology to release a statement saying it "belongs in a supermarket tabloid." HBO is already preparing for a litigious response from the Church of Scientology; company president of documentary films Sheila Nevins told THR that they have "probably 160 lawyers" vetting the film.