Voices of Angels - Sins of Angels, #3

A superweapon. A lost world. Galaxies poised to stop them. The Sefer Raziel led Rachel Jordan astray. Instead of answering all her questions, it posed infinitely more. Now at the helm of an ancient starship more advanced than anything humans can build, she's at the center of an intergalactic controversy. Her government wants the ship. If Rachel were to hand it over, she'd be acclaimed as a hero. But that would end her quest for the secret truth behind the angels' rule of mankind.
The angels' starship holds the answers, and the one she latches onto is the site of humanity's birthplace: Eden. Rachel is about to discover why the angels hid away the cradle of humanity for three thousand years.