Friday Fiver Challenge

This will be the last of the challenges, so here's your final chance to show what you know. Five sentences from the fifth chapter of a Kalquor universe book...can you name it?

He heard the dying screams in his head. Saw again the explosions of fighters in black, forbidding space. “I’ll never be ready to hold the lives of others in my hands again. I won’t be liable for the death of one more man. The answer is no.”