When her mentally ill mother passes away, Annie (Toni Collette), her husband (Gabriel Byrne), son (Alex Wolff), and daughter (Milly Shapiro) all mourn her loss. The family turn to different means to handle their grief, including Annie and her daughter both flirting with the supernatural. They each begin to have disturbing, otherworldly experiences linked to the sinister secrets and emotional trauma that have been passed through the generations of their family.

Dani (Florence Pugh) and Christian (Jack Reynor) are a young American couple with a relationship on the brink of falling apart. But after a family tragedy keeps them together, Christian invites a grieving Dani to join him and his friends on a trip to a once-in-a-lifetime midsummer festival in a remote Swedish village. What begins as a carefree summer holiday in the North European land of eternal sunlight takes a sinister turn when the insular villagers invite their guests to partake in festivities that render the pastoral paradise increasingly unnerving and viscerally disturbing.