Choice is not a state you achieve. It is a practice you keep.
Five years after Ascendant's emergence, Riko Vega runs a galaxy-scale Network from fourteen simultaneous presences — and still shows up to bylaws meetings at 0400. The dropout has grown into the Nexus. The seventeen-year-old is still underneath.
Then Dr. Novara brings the invitation. The civilization beyond the galactic rim was never alone. They are one voice in a universe-scale Community of evolved civilizations that has been watching humanity reach communicable maturity — and the Community wants humanity in. They have been defending themselves, across cosmic time, against something called the Harvest. The local node of that Harvest, aeons ago, planted the seed that became Zeta.
Riko extends her consciousness across intergalactic distance for the first time. Together she and Zeta discover the Community's quiet places are not natural drift. They are slow harvest infiltration no member has ever seen from the inside.
Humanity has one thing no other civilization has: the technique that converted Zeta. As Riko offers that technique to a twelve-million-year-old refugee who never knew the choice existed, the deepest layer of the Harvest answers from a dimension the universe-mind cannot reach.