When a boy vanishes in the small German town of Winden, four intertwined families begin to unravel a secret buried beneath the local nuclear plant, one that bends time itself. What starts as a missing-child case spirals into a labyrinth of paradoxes, spanning generations and eras that fold back on one another with dizzying precision. Cold, cerebral and impeccably constructed, the show trades jump scares for existential dread and the terrible logic of cause and effect. It is a puzzle-box thriller about fate, free will and whether the past can ever truly be changed.