After discovering an unexplainable void in the fabric of space at the edge of the solar system, Ian MacGregor secretly spent his life unraveling the finding. He did not know his discovery would reshape humanity's understanding of its past and future.

So when his son, Peter, left Earth aboard the explorer-class vessel Shackleton on an ambitious mapping of the solar system's furthest reaches, they did not expect to be confronted with the greatest mystery in mankind's history.

Now millions of miles from Earth, Peter MacGregor and his crew must reach into the void to save an extinct civilization.