Light Years from Tranquility:

As a hostile alien fleet destroys space colonies, the populations of inhabited planets become paralyzed with fear, halting human expansion among the stars. Unaware that these events have transpired in his absence, Starship Captain Erik Houston returns to his home planet. Vessels like his travel at close to the speed of light, causing time to drastically slow down aboard ship. Star travelers thus become time travelers.

Houston can't stop thinking about Zama, that woman from his last mission. She was a planet dweller with whom he had worked under some difficult circumstances. A shocking discovery aboard his ship has led him to question her motives. He nevertheless seeks to get reassigned to her planet. But instead the brass send his crew and he on a high risk, strategic mission against the aliens. Will the humans complete their task and get back to safety without getting caught up in the imminent war between two rival species?

Read this sequel to Lewandowski's first novel, Light Years From Paradise.