Halo: Glasslands (Halo #8)

Across the galaxy, a woman thought to have died on Reach is actually very much alive. Chief scientist Dr. Catherine Halsey broke every law in the book to create the Spartans, and now she's broken some more to save them. Marooned with Chief Mendez and a Spartan team in a Forerunner slipspace bubble hidden in the destroyed planet Onyx, she finds that the shield world has been guarding an ancient secret—a treasure trove of Forerunner technology that will change everything for the UNSC and mankind.
As Kilo-Five joins the hunt for Halsey, humanity's violent past begins to catch up with all of them as disgruntled colony Venezia has been biding its time to strike at Earth, and its most dangerous terrorist has an old, painful link with both Halsey and Kilo-Five that will test everyone's loyalty to the limit.
Halo: Glasslands by Karen Traviss is thrilling, action-packed science fiction that longtime Halo fans and newcomers alike will enjoy.