Thou Traveler Unknown

Long ago, in the aftermath of an impossible and bloody victory, a stranger in a blue box helped Ender Wiggin find his feet again. Now Ender is Andrew, centuries from home with secrets under his bed, and it is his turn to put the pieces of his war-torn old (new?) friend back together. (Time is so confusing.) Angst, character parallels, and some cool stuff about Gallifreyan biology.