Against Gravity

From the back cover of the Tor 2013 TPB: "If you lived long enough this could be your future - Little is as it used to be, and many are not who they seem. In the late twenty-first century, it's a very different world. Meet Kendrick Gallmon, survivor of the Maze. In this covert research facility, political prisoners become unwilling participants in an experiment to turn them into perfect soldiers. Now Kendrick is trying to pick up the pieces of his life. But he knows his nervous system, now riddled with unstable nanotech augmentations, is slowly killing him. Then one day his heart stops beating, forever, and a ghost urges him to return to the source of all his nightmares. A long-abandoned military complex, filled with entirely new voices of the dead..."