what is the solution to the story?

Tobias, however, finally believes that what Tris says is true, and forces Caleb to help disarm the security system on the computer so they can get the information. Just as Evelyn is talking about how there will no longer be any factions, Tobias comes down and plays the video that he has retrieved. It is a woman speaking about how the factions were created as an experiment in order to get rid of the flaws in human nature and create Divergent people with flexible, virtuous minds. Lastly, she reveals that she will be joining the society, too, voluntarily forgetting everything and taking the name Edith Prior.