Picking up 3000 years after Ender’s Game Ender becomes the Speaker for the Dead in penance for his destruction of the Buggers, another sentient species. He and his sister travel throughout the galaxy looking for a place to save the last Bugger Queen. In so doing they travel to a planet inhabited by Piggies, another sentient species that at the close of their second life turn into trees. The only trouble is the Starways Congress is going to destroy the planet because of a sentient virus.

Not as much of a must read as Ender’s Game, but still ok.