Sara runs a private psychology practice for troubled youth in the newly inherited house she is refurbishing with her husband, Sigurd. One morning, a voicemail from Sigurd tells Sara he's arrived at a holiday cabin for a weekend away with the guys. A couple of hours later, Sigurd's friends call from the cabin asking where he is — according to them, Sigurd never arrived. Sara is irritated by what she thinks is a practical joke. But as the hours stretch out, her anger turns to fear, and the large empty house begins to feel increasingly threatening. To get to the root of Sigurd's disappearance, Sara must question everything she knows about their relationship. But can she trust her own thoughts? And where is she safe?