Ender had finally found a hospitable planet for Doryphores: Lusitania, the same planet where living together somehow the Pequeninos and humans. And while it's finally come to understand why the two xenobiologists were killed by Pequeninos, the threat of total destruction of the entire planet is however not excluded. Indeed, the Stellar Congress sent a ship loaded of Molecular Disruption device and gave him the order to use it against Lusitania. The ship will thirty years traveling the distance to the target. Thirty years is the time remaining to Ender and his friends to find a solution. But the problem is complex because the descolada, the deadly virus for Men and vital to the reproductive cycle of Pequeninos, remains an enigma. Fortunately, Doryphores, Humans and Piggies are not alone: a fourth race just made its appearance and reveal its existence Jane. Jane, the IT entity created when philotique contact between Ender and Queen of Doryphores and extending across the entire network of ansibles - these data transceivers working instantly. But all their efforts be enough and a new Xenocide avoided? In this third part, the plot becomes more complex without damaging the psychological development of the characters. Rather, they are expanding and we can only salute the performance of the author!