I attempt to describe it here:
It’s less a formal interview than Fielder and his crew hanging out with Holmes and Evans while they go about their everyday lives, trying to understand what they see. Fielder does ask pointed questions, and appears to get more and more exasperated with Holmes’ stonewalling, but the film ends up going in a completely unexpected direction, such that, by the end, Holmes becomes this lens to examine a wide range of thorny issues, one of which is the inherent subjectivity of trying to make a film like this.
It was really entertaining, in a “holy shit is this really happening?” kind of way, and it’s really effective at sucking you into Fielder’s perspective as he is trying to make sense of all this, but it’s not just entertainment fodder. This is a serious film with real artistic merit. I’ve never seen anything quite like it.
That said, it’s going to leave the viewer with more questions than answers, so this is not a movie I would recommend to people who want more details about the Theranos scandal or anything like that. I went into it not knowing much about what Holmes actually did and I left it none the wiser. It takes her crimes as a given, and is more interested in exploring the psychology of someone who would do those things - and particularly her effect on other people.