#ItWasAPublicRoad trended on twitter in the hours following the premiere of Louis Theroux's explorative documentary, My Scientology Movie. A public flag of solidarity held up in support of Louis' brilliant study of the strange and secretive religion. We find ourselves very much back to the style of Louis Theroux's Weird Weekends from the early 2000s, as we approach the mysterious and frightening subject of Scientology from an objective and slightly humorous perspective which makes for both a refreshing and wildly captivating movie.

The film slides in neatly amongst other great works of investigation like Alex Gibney's Going Clear and Jon Sweeney's Panorama special Scientology and Me. While they are enlightening, albeit fact heavy, My Scientology Movie takes what we already know about Scientology and picks a more grounded, realistic and analytical perspective. Fascinated not by the reasons why people left Scientology, but the reasons why people joined, Louis takes us on a journey through the techniques and technology used during recruitment and advancement within the religion under the guidance of Marty Rathbun - an ex-Scientologist who for more than a decade was inspector general on the top tier of the church's hierarchy - a kind of superintendent in strong-armed spirituality.

Louis' usual style of relationship-building and trying to see human qualities in people who have been caricatured or seen in very broad brushstrokes became an impossible task after Scientology closed its doors and refused assistance with the movie. Louis' answer to this hurdle is what makes this film stand firmly out from the rest. We watch as Louis and Marty hold casting calls for David Miscavige and Tom Cruise. He sets out to use actors to recreate speeches and scenes from true recorded events as well as a compelling set of scenes dramatising some of the brutal disciplinary practises that are alleged to have taken place in a bunker known as 'The Hole' at Gold Base, the church's international mission control. What we end up with is an incredible insight into what kind of personality traits are necessary to survive in high positions in the upper-echelon of Scientology, this becomes the driving force of the movie.

What becomes abundantly clear is the ambiguity of Marty Rathbun's motivations within the movie. It's hard to tell whether watching and being a part of these, often violent, reenactments is a cathartic experience for him or a thrilling one. Despite the harassment he suffers - both on and off camera - at the hands of Scientologist Investigators, as an audience you are left questioning whether he wants to be there for the right reasons. Watching his behaviour before, during and after the reenactments is equally as uncomfortable as it is fiercely fascinating. Louis' famously unbiased and empathetically persistent approach to characters such this doesn't let us down. He pulls up Rathbun in one of the highlights of the movie, leaving us breathless with anticipation and tension.

In classic Louis Theroux fashion, we see his encounters with the ever-terrifying Scientologist Investigators turn from unnerving to whacky as he displays his wonderfully unflappable politeness and catches notoriously aggressive Scientologist investigators off-guard. The hashtag, #ItWasAPublicRoad, comes directly from one of those pivotal scenes following a disagreement over who owned a public road between Louis and two such investigators. We've seen journalists investigate Scientology and its parishioners before, now we've come to expect our investigators to be investigated in return. This scene is just one example of why it's important for journalists like Louis Theroux to tell these stories, because what we usually find to be scary or unsettling turns, instead, into hilarious trending hashtags. We've learned that part of the power that Scientology has is 'fear' and Louis dismantles that very politely and carefully with a smile.

My Scientology Movie is the missing link between everything we knew about Scientology and everything we didn't know, shedding a harsh light on the kind of conditioning parishioners go through in order to help us gain a deeper understanding of what it means to become a Scientologist and to remain a Scientologist. With a lot less material to work with, a lot less 'secrets' to uncover after the release of Going Clear in 2015, Louis Theroux manages to - once again - take us on a journey into Scientology that is both intriguing and revealing in a totally new way, a way that is entirely his own. In that familiar 'Louis Theroux' style, he is able to both make us laugh out loud and terrify the socks off us in the short space of ninety minutes. The soon to be legendary line "Catherine, you don't have to leave, you're not trespassing!" delivered to the back of an angry Scientologists head, will only serve to seal his status as King of Journalists.