Aaliyah Mendes, Shawn's little sister has stage 4 lung cancer, and she have a short amount of time to live. Shawn's parents died in a car accident, leaving him the legal guardian of Aaliyah, and slowly Shawn begins to break down slowly. Shawn cancels all tours to watch over his little sister, and the one keeping Shawn from killing himself is none other than Taylor Caniff. Aaliyah knows she's going to die, but before she does she writes Taylor a letter with one sentence that he must promised to keep, "Keep him going"