Orson Scott Card

The Ender Saga continues with Shadow of the Giant, which parallels the events of Ender's Game from a different character's point of view.
Bean's past was a battle just to survive. He first appeared on the streets of Rotterdam, a tiny child with a mind leagues beyond anyone else. He knew he could not survive through strength; he used his tactical genius to gain acceptance into a children's gang, and then to help make that

The War is over, won by Ender Wiggin and his team of brilliant child-warriors. The enemy is destroyed, the human race is saved. Ender himself refuses to return to the planet, but his crew has gone home to their families, scattered across the globe. The battle school is no more.
But with the external threat gone, the Earth has become a battlefield once more. The children of the Battle School are more than heroes; they are potential weapons that

It began with a quarrel over which newborn should be the baby Jesus in the town's Christmas pageant. Decades later, two scientists arrive to study small-town genetic patterns, only to run up against the invisible walls that split the leading citizens into two congregations that can only be joined by love and forgiveness. And maybe a little deception, because there might be some things that people just don't need to know.

Orson Scott Card's The Last Shadow is the long-awaited conclusion to both the original Ender series and the Ender's Shadow series, as the children of Ender and Bean solve the great problem of the Ender Universe—the deadly virus they call the descolada, which is incurable and will kill all of humanity if it is allowed to escape from Lusitania.
One planet.
Three sapient species living peacefully together.
And one deadly