Tom and Diana are caught in the middle of an international incident when Edwin Mayuya, a 4400 with the ability to repair damaged chromosomes in utero, is revealed to be a Rwandan war criminal. Despite the good Edwin has done, NTAC must weigh whether it is enough to absolve him of his crimes against humanity. Meanwhile, Richard attends a bittersweet reunion with his old Korean War buddies; Diana deals with her sister April's abuse of Maia's power; and Shawn tries to reconnect with his own family.