US Millennium is structured as a long-form narrative system.

The book installments operate as seasonal architecture.

One book equals one season.

The Swedish six-part television adaptation is treated as a completed external reference — not structural precedent.

Miniseries (millennium, Cold Case / Harriet Vanger, Milton Security) operate as parallel pre-season development arcs.

Their function is atmospheric and infrastructural — not titular.

The book titles function as season names.

“Millennium” does not operate as a narrative subtitle in long-form format.

It remains institutional identity — not story attribution.