What Happens at Night is a chilling horror-mystery that masterfully blends psychological tension with supernatural dread. The film follows an American couple whose journey to a remote, snowbound European town for a seemingly straightforward adoption quickly descends into a nightmare. Their sanctuary, a grand yet eerily empty hotel, becomes a labyrinth of unease, populated by a cast of unsettling characters including a mysterious chanteuse, an enigmatic businessman, and a cryptic faith healer.

The film's greatest strength lies in its atmospheric direction, which uses the oppressive silence and stark whiteness of the winter landscape to create a profound sense of isolation and paranoia. As the couple's pursuit of the baby intensifies, the very fabric of their reality begins to fray. The line between dream and waking life, between truth and deception, becomes dangerously blurred, forcing them to confront not only the hotel's secrets but also the fractures in their own marriage and life choices.

Viewers should watch What Happens at Night for its superb slow-burn tension and exceptional performances that capture the gradual unraveling of sanity. It is a film that prioritizes mood and psychological horror over cheap jump scares, resulting in a deeply unsettling experience that lingers long after the credits roll. The ambiguous, thought-provoking narrative invites multiple interpretations, making it a perfect choice for fans of atmospheric thrillers that challenge as much as they terrify.