We first meet Sequoia and her family (parents, brother, little sister) and we see how rude and snobby she can be as a popular girl in Charlestown Highschool
Her twin brother Jacob catches the disease the changes his memories (she calls disease the bad) along with other people from town, unlike others Jacob understands that he has a disease.
After both of her parents are kidnapped and killed by her brother Sequoia goes on an adventure to find a cure for the disease to save her brother, along the way she meets carlos, who is also looking for the cure, and leaving her little sister behind in a cave somewhere
Resolution & Denouncment
In underground lab, all plot lines come together and in a rush Sequoia injects both Carlos and Jacob with the cure
Jacob says "There is no white anymore. Just shades of grey. And black." in delirium and then passes out along with Carlos, who, was also infected
The siblings learn to live without their parents and Carlos lives close to them. Jacob and Carlos suffer from outbursts of sorriness for murder.