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Detective Jason Bard investigates a series of precisely timed murders that force Gotham to confront a buried legal case and the horrifying logic of Julian Day, the Calendar Man. But when a second wave of killings emerges without structure, markings, or clear meaning, Bard realizes the greater danger is not the pattern itself — but the city’s need to believe one exists. Across two seasons, the series follows Calendar Man’s transformation from a killer of dates into a symbol of obsession, interpretation, and the terrifying human urge to turn chaos into meaning.