A thirteen-year-old girl lives alternately with each of her divorced parents, constantly changing her identity. Her diary becomes a profound exploration of self-discovery and uncovering her own essence in a world split into two parts. Thirteen-year-old Mary Marie Anderson is raised separately by her mother and father after their divorce, so by court decision she spends half a year with her father and then half a year with her mother. To meet her parents’ expectations, she adopts different personas: in one city she is modest Mary, and in another she is cheerful Marie. In her diary, which she hopes to turn into a love novel, she describes her experience living in these two roles, reflects on her feelings, and tries to understand who she truly is—Mary or Marie.