Two hundred years from now, humanity has spread across the solar system but remains trapped within it. Earth is overcrowded and politically dominant, Mars is a century into a terraforming project that defines its culture, and the Belt is home to workers whose bodies have been reshaped by low gravity and whose relationship with the inner planets is one of economic dependency and mutual contempt. Into this tense three-way standoff comes the protomolecule: an alien substance billions of years old that does not behave like biology or technology but something in between. Its discovery drives the first half of the series. The second half opens outward, through a network of gates to thirteen hundred new solar systems, and the question shifts from what the protomolecule is to what happened to the civilisation that built it. Hard science fiction with real physics, grounded politics, and a small crew on a single ship who keep finding themselves at the centre of events that dwarf them.