Hugo award-winning author, John Scalzi returns to his bestselling Old Man's War universe
Humans expanded into space...only to find a universe populated with multiple alien species bent on their destruction. Thus was the Colonial Union formed, to help protect us from a hostile universe. They used the Earth and its excess population for colonists and soldiers. It was a good arrangement...for the Colonial Union. Then the Earth said: no more.

Now the Colonial Union is living on borrowed time before their ranks are depleted and the struggling human colonies are vulnerable. Against aliens, and another enemy, playing human and alien against each other--and against their own kind--for their own unknown reasons.

In this collapsing universe, CDF Lieutenant Harry Wilson and the Colonial Union diplomats race against the clock to discover who is behind attacks, and keep humanity's union intact...or else risk the end of all things.