The Ghost Line: The Titanic of the Stars by Andrew Neil Gray and J. S. Herbison
The Martian Queen was the Titanic of the stars before it was decommissioned, set to drift back and forth between Earth and Mars on the off chance that reclaiming it ever became profitable for the owners. For Saga and her husband Michel the cruise ship represents a massive payday. Hacking and stealing the ship could earn them enough to settle down, have children, and pay for the treatments to save Saga's mother's life. But the Martian Queen is much more than their employer has told them. In the twenty years since it was abandoned, something strange and dangerous has come to reside in the decadent vessel. Saga feels herself being drawn into a spider's web, and must navigate the traps and lures of an awakening intelligence if she wants to go home again.