Here's what critics who saw Nathan Fielder's secret Elizabeth Holmes doc are saying

Weeks before Elizabeth Holmes entered federal prison after being convicted of fraud, the Theranos founder welcomed a film crew into her home.

The first teaser for the resulting documentary, "You Can See Everything," makes it seem like a mind-bending thriller starring the fallen tech visionary.

A24 surprised critics at the Telluride Film Festival on Sunday night with a screening of the closely held project, which had been kept under wraps for three years. It hits theaters in October.

Journalists who attended the screening wrote that phones and smart glasses were bagged upon entry. The festival director asked for secrecy on plot twists and a celebrity cameo.

"What happens in Telluride stays in Telluride," she told the crowd, Los Angeles Times reporter Josh Rottenberg recalled.

YOU CAN SEE EVERYTHING, a documentary by Nathan Fielder and Lance Oppenheim. Featuring Elizabeth Holmes. Only in theaters this October. pic.twitter.com/b3Pcx0Se2o

Comic Nathan Fielder and filmmaker Lance Oppenheim, whose A24 feature "Primetime" is also making the festival circuit, directed the documentary. Fielder's signature blurring of real life and character acting is on full display as he presses Holmes and her partner, Billy Evans, on whether they are telling him the truth.

A one-minute teaser shows an exchange between Holmes and Fielder. Holmes insists she has nothing to hide.

"I'm not that person," she says, adding that she is engaging with him "as a human being." Fielder then asks whether she is being real.

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