Rigel Kentaurus by Rick Novy
Price: $4.95 USD. 93520 words.
Published on May 22, 2012. .
It's the first human voyage outside the solar system, and Proxima Centauri is the destination. The sleeper ship Deep Space discovers we are not alone, and not everyone out there is nice.
Diverted to Alpha Centauri A (Rigel Kentaurus) for a faster-than-light prototype, they learn humanity is the only civilization to solve the light barrier problem. Now, they must defend it as a military secret.