Mac Mackenzie is fifty-eight years old with a titanium knee and a tremor in his left hand. He is also the only pilot alive who can thread a spacecraft through an orbital debris field without a computer.When a catastrophic collision threatens to make low Earth orbit permanently uninhabitable, Mac is pulled out of retirement for one final mission. But the debris field isn't random. Someone built it. And they're watching to see if anyone is good enough to fly through it.Black Sky is the explosive opening of the Brooks Hammer universe — a twenty-book near-future military thriller series spanning six eras of human conflict and technological warfare.Book 1 of 20. The war starts here.