The Nebula Award–winning author of the Alex Benedict novels and the Priscilla Hutchins novels returns to the world of Ancient Shores in a startling and majestic epic.
 
A star gate more than ten thousand years old has been discovered on a Sioux reservation in North Dakota. Travel through the gate currently leads to three equally mysterious destinations: (1) an apparently empty garden world, dubbed Eden; (2) a maze of underground passageways; or (3) a space station with a view of a galaxy that appears to be the Milky Way.
 
The race to explore and claim the star gate quickly escalates, with those involved dividing into opposing camps who view the teleportation technology either as an unprecedented opportunity for scientific research or a disastrous threat to security. In the middle of the maelstrom stands Sioux Chairman James Walker. One thing is for certain: Questions about what the star gate means for humanity’s role in the galaxy cannot be ignored.
 
Especially since travel through the star gate isn’t necessarily only one way...