Arya has a pretty excellent week in general, beginning with her playing a game of lies. But the real meat of her story comes when a father brings his sick daughter to the House of Black and White. Arya gives the girl water, telling her that if she drinks the it, and prays to the Many-Faced God, then she will be saved. Its a lie, because Arya knows full well that the water will kill her. However, its not really a lie, because the girl is saved from suffering, and instead has a peaceful, painless death. From there, she finds her way into the creepily impressive Room of Many Faces (unofficial title), where Jaqen Hghar tells her that she isnt ready to become no-one, but maybe shes ready to become someone else. Its a good scene in its own right, and considerably advances Aryas path to becoming a Faceless Man.