Numina Code. The Abiota Series, #3

Distant stations hold deep secrets. Space travel's never been high on Daelia's list of things to do in life. She doesn't care what the tourism brochures say. It can't really be safe, can it? Argo's brother is missing, though. Last known location? Numina Station. Argo's always protected the kid and always will, but that means figuring out a way to get up into orbit, at a time when the whole world wants to see the wonders Unity has brought them.
And flights are impossible to come by. It's just Daelia's luck that Argo needs her help, her business connections, to get up there. And doesn't it figure, she has to go along herself. At least it's an opportunity to continue her investigation into Unity. But Numina Station is far more entwined in Unity's plans than either Daelia or Argo suspected. When the true nature of Unity there is revealed, can they make it back to Earth alive? Or will the truth die with them?