After the sudden and unexplained death of his 19-year-old sister Lauren, Patrick is left grieving, struggling to understand how a young person could go to sleep and never wake up. Every year, over 600 young and seemingly healthy people die suddenly and unexpectedly from sudden cardiac death. Lauren's death was registered as SADS, or Sudden Adult Death Syndrome, a cause of cardiac death even the experts don’t completely understand. Patrick finds himself unable to talk to his friends or family, but he needs answers. What could have been done to prevent Lauren’s death, and is there a way to stop other young people dying this way?