The fourth in the Ender’s Game series. Well… there’s a reason why a “trilogy” is a thing and a 4-book series is not. Perhaps by book 4 an author just needs a rest or a change in scenery – maybe a trip to Risa? There’s altogether too much bitching between the main characters in this novel. Also somewhere in one of the last books instantaneous space travel was invented which I don’t approve of. It makes it too easy to pop in and out of any situation. There was a reason why the universe was given the speed of light and causality, and it was to add discipline to novels. The viruses are pretty good though.