"Midsommar" is a horror movie directed by Ari Aster, released in 2019. The story follows a young woman named Dani (Florence Pugh) who experiences a family tragedy and then decides to join her boyfriend Christian (Jack Reynor) and his friends on a trip to a remote Swedish village to attend a summer festival that only occurs once every 90 years.

Upon their arrival, they discover that the seemingly idyllic community has some dark and disturbing rituals, and as the festival progresses, the group becomes increasingly involved in these traditions, which include human sacrifices and other macabre events.

As the tension and horror escalate, Dani becomes increasingly unstable, and the group finds themselves in a fight for survival against a cult that is willing to do whatever it takes to preserve their way of life.

Overall, "Midsommar" is a disturbing and unsettling movie that explores themes of grief, trauma, and the dangerous power of group mentality.