The trailer for Steven Soderbergh’s latest thriller UNSANE has landed. The unsettling horror follows Claire Foy (The Crown), who leaves town to escape a stalker. Somehow then, she’s involuntarily committed to a mental institution where she has to uncover whether it’s all real or a serious delusion.

“With seemingly no-one ready to believe her and the authorities unable or unwilling to help, she must confront her fears head on,” a synopsis of the movie reads. “With twisting perspectives and a shocking narrative, Unsane asks questions about our perception of reality, our survival instinct and the system that is supposed to take care of us.”

The film, inspired by Tangerine and Florida project director Sean Baker’s methods, was entirely shot on iPhones. Speaking to Indiewire about this means, Soderbergh said: “There’s a philosophical obstacle a lot of people have about the size of the capture device. I don’t have that problem. I look at this as potentially one of the most liberating experiences that I’ve ever had as a filmmaker, and that I continue having. The gets that I felt moment to moment were so significant that this is, to me, a new chapter.”

UNSANE’s lo-fi aesthetic and tight shots add to the growing claustrophobia and feeling of general what-the-fuck-is-going-on-ery. Whether it’s a case of intense cyber-stalking or a total breakdown, it looks like a pretty terrifying offering from the Logan Lucky and Contagion director.

UNSANE is set to debut in cinemas March 23