Just as their relationship is on the brink of falling apart, couple Dani and Christian are brought closer by a family tragedy. The mourning Dani then joins Christian and his friends, Josh and Mark, on a trip to a rural Swedish village that is celebrating a once-in-a-blue-moon festival. As the tourists partake in the celebrations, they discover that the idyllic community holds many unnerving secrets, and it all unfolds in broad daylight.