Public eyes are on the Apollo Moon mission, but it's the secret space race that will decide who wins the Cold War.
In the dark recesses of a hangar, hidden deep in the Mojave desert, an experimental hypersonic aircraft lurks in the shadows.
A secret to all but a handful of men, the XS-81 has a very specific task, ready to protect the United State's military secrets from a new wave of Soviet satellites.
To crew a highly sensitive first miss...
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