A co-production between Germany and the United States, the film follows a teenager Schafer who moves to the German Alps to live with her father Csokas but becomes disturbed by strange occurrences as her father's boss Stevens embroils her family in a sinister plot. The film was released theatrically in the United States on August 9, , and in Germany on August 29, After the death of her mother, grieving teenager Gretchen moves with her father Luis, stepmother Beth, and mute half-sister Alma to a resort town in the Bavarian Alps.
Soon after their arrival, strange things begin to happen. While working at the reception desk Gretchen encounters multiple female guests vomiting, Alma suffers seizures triggered by a mysterious reverberating shriek, and Gretchen has a terrifying encounter with a hooded woman while biking home one night, but the incident is dismissed by police as a prank.
Gretchen meets a detective named Henry who is investigating a murder linked to the hooded woman. She also becomes close to a female guest named Ed, and the two plan to run away together. However, their escape attempt is thwarted when they hear the disorienting shriek, nearly run over the hooded woman, and crash their car, leaving Gretchen severely injured and confined to the resort as Ed recovers in the hospital.
Henry explains to Gretchen that he believes the hooded woman is responsible for at least one murder, which ended in the female victim choking on her own vomit. He believes that one of the vomiting women who Gretchen saw earlier may be connected. She and Henry stake out a cottage, where the hooded woman attacks Gretchen's coworker, Trixie, in an attempt to implant her with a mysterious slime. Luis confesses that he sold their old family home.
Enraged, Gretchen retreats to her room with the package and listens to the recordings on her mother's answering machine. Among them, she hears a voicemail from Alma, using text-to-speech , imploring Gretchen's mother to contact Gretchen to make her happy. Gretchen emerges from her room to find her family missing.
