The House of Saints (Venus Ascendant Book Two) - Derek Kunsken

The Stunning conclusion to the Venus Ascendant series, from the world of The Quantum Magician. George-Étienne and his children have formed The House of Styx, after finding a mysterious artefact on the surface of Venus herself. But with the discovery comes great risk, not only from a planet that kills with its very touch but also from the banks and powers of old Earth, who will stop at nothing to claim this new technology for themselves.  From humble origins, The House of Styx is determined to become one of the most powerful families in the known galaxy or die trying.