A Traveller wakes on a remote planet with amnesia and must repair a crashed starship. Driven by an unknown force, the Traveller sets out to reach the centre of the galaxy.

Along the way, the Traveller encounters three alien species and discovers a space anomaly containing Nada and Polo, who speak of a strange entity at the galaxy’s core. The Traveller also receives transmissions from another lost Traveller named Artemis and investigates their fate.

At the end of the journey, the Traveller meets the Atlas, a cosmic being managing a simulated universe. The Traveller must choose whether to reset the simulation or reject the Atlas and continue exploring freely.