Never Look Back by Grace Bridges in Space Battles: Full-Throttle Space Tales #6, from Flying Pen Press
Mars. Ten years ago. I didn’t kill him, I swear. It was an accident. And now his brother wants to kill me. I ran from him, into the farthest reaches of travelled space. But now my sister wants to die. I have to fight for her life before we can fight for both of us. Somewhere out there is my enemy…and he’s coming for me.