Sabrina, a 19-year-old Canadian, arrives in Norway for an internship and moves into an apartment beneath her landlords, Ingrid and Erik. On her first night, a kitchen accident, a locked door and a stranger at the window unsettle her. Calls from her overprotective mother, Olivia, fuel her anxiety until every unfamiliar sound and encounter feels threatening. As Sabrina doubts her own judgment, even her mother’s involvement becomes suspicious. The next morning, she discovers photographs linking Olivia to the couple, then finds her mother at the foot of the stairs.