What Happens at Night is a chilling horror-mystery that masterfully blends psychological tension with atmospheric dread. The film follows an American couple whose journey to a remote, snowbound European town for a seemingly straightforward adoption descends into a surreal nightmare. Upon arriving at their isolated, archaic hotel, they encounter a gallery of unsettling characters: a haunting chanteuse, an enigmatic businessman, and a mysterious faith healer, each seemingly guarding secrets that warp the couple's perception of reality.

The film's greatest strength lies in its oppressive atmosphere. The director uses the claustrophobic hotel and the endless, silent snowscape to create a palpable sense of isolation and creeping unease. The plot cleverly subverts expectations, transforming a personal quest for a child into an existential inquiry into the couple's own marriage and sanity. As the line between nightmare and reality dissolves, the pursuit of the baby becomes a desperate fight for survival and truth.

Performances are uniformly compelling, with the lead couple perfectly portraying the gradual erosion of their certainty and comfort. The supporting cast of odd hotel denizens adds layers of cryptic menace. For viewers seeking a smart, slow-burn thriller that prioritizes mood and psychological horror over cheap jumpscares, What Happens at Night is a must-watch. It's a film that lingers, leaving you to question what is real long after the credits roll, making it a standout in the modern mystery-thriller genre.