Cormac is trapped with only himself for company on a nightmare journey in a spacecraft he can't control. We know his comrades are dead, so tension and emotion come from the back story and the problem of how he resolves his destiny. I didn't understand the science, but was intrigued by the exploration of trust deception and betrayal. How well do you know your colleagues? Yourself? And I was gripped by the need to know how the end would come.