Midsommar

American student Dani is left deeply traumatized after her bipolar sister Terri kills their parents and herself via carbon monoxide poisoning. The incident further strains Dani's relationship with her increasingly distant boyfriend, a fellow student named Christian, who, with his friends Mark and Josh, has been invited by their Swedish friend Pelle to attend a midsummer festival at his ancestral commune, the Hårga, in the rural Hälsingland region of Sweden. The festival occurs only once every 90 years; Josh, who is writing his thesis on European midsummer festivities, regards it as a once-in-a-lifetime opportunity. Christian had not discussed the trip with Dani, as he intended to break up with her before her family tragedy happened, but he reluctantly invites her along after an argument.