A wife's suspicion about her husbands infedility turns into an obsession for the woman he is suspected of cheating with.

Accomplished and beloved Dr. Hillary Spenser is known as "the Angel of the East Wing" for the way she treats her patients. One patient in particular, Gregory Lipton, mistakes her compassion for adoration and becomes obsessed, willing to do whatever it takes to fulfill his misguided vision of their future together.

When Chelsea meets up with her estranged childhood best friend, Milla, she's unprepared for the events that follow. Milla, who is now a webcam girl briefly catches Chelsea on camera during one of her shows. Unbeknownst to her, Chelsea has now been exposed to a watcher who becomes obsessed and will stop at nothing to have her to himself.

Bob, a famous novelist, seeks to write a more serious book, only to find himself tumbling down a spiral of obsession that may leave his most important relationships in shambles, including his marriage.

There, but for the grace of God, goes Maud, a reclusive young nurse whose impressionable demeanor causes her to pursue a pious path of Christian devotion after an obscure trauma. Now charged with the hospice care of Amanda, a retired dancer ravaged by cancer, Maud's fervent faith quickly inspires an obsessive conviction that she must save her ward's soul from eternal damnation - whatever the cost. Making her feature-film debut, writer/director Rose Glass cannily lures the audience into this disturbed psyche, steadily setting up her veritable diary of a country nurse for an unnerving and ultimately shocking trajectory. Morfydd Clark (also at the Festival in The Personal History of David Copperfield) portrays the sanctimonious Maud with an intense stoicism that belies a disquieting vulnerability, as Maud desperately vies for absolution and solidarity from her embittered patient (an enthralling Jennifer Ehle, also at the Festival in Beneath the Blue Suburban Skies). Glass tenderly captures this relationship with an empathetic gaze that first assumes an ethereal, dreamlike atmosphere - but it isn't long before Maud's dogmatic candor incites an irreconcilable friction that spirals her mind into a suffocating confluence of creeping doubt and paranoia. As Glass tightens the screws on her misguided martyr, well-placed nods are made to religious horror forerunners like William Friedkin's The Exorcist, further contributing to the film's increasingly dread-filled malaise. And when this insidious fever climatically breaks, the consequences are devastating and terrifying in equal measure.

An affectless writer is lured to a couples weekend getaway by his wife and friends, only to uncover a tumultuous secret and a perilous obsession that threaten to change the course of his life in intense and surprising ways.