In a quiet town in California, the sun shines brightly, but the connection to darkness soon manifests through a series of fatal events. Three children born during a lunar eclipse in 1970, now on their eleventh birthday, unleash a wave of murders one after another. As their friends and family fall, one by one, the evil that dwells within them becomes more evident.
The young ones, led by the charismatic and manipulative Timmy, display unsettling and disturbing behavior. There is no trace of the innocence one would expect from a group of children; instead, a murderous instinct awakens with each celebration. A friend in the group, a young girl filled with doubts who begins to suspect their dark secrets, tries to warn the adults in the town, but no one seems to pay her any attention. Birthday parties transform into crime scenes as the three children perfect their macabre game.
With a tone that is both unsettling and somewhat comedic, the story explores the nature of evil in childhood, reflecting fears about the influence of the environment and the development of psychopathy. Soon, the town faces a nightmare that seems never-ending, and a group of adults is forced to fight not only for their own lives but also for the salvation of their children. The chilling atmosphere intensifies, leaving the audience wondering if the innocence of a child can ever truly be trusted.