Lois McMaster Bujold,Bujold - Memory (Baen Books)

Thanks to his quick-thinking staff, Miles Vorkosigan's first death won't be his last. But the next one might be. When he returns to military duty, Miles realizes that his late death seems to be having a great effect on him. Unfortunately, his weakness reveals itself at the wrong time and place, and Miles must face Barrayaran security chief Simon Illyan. Now things look bad, but Miles's worst nightmares about Simon Illyan don't compare to Illyan's worst nightmares--or are they memories?