Augustus' Ghost is about how a year after Gus dies, his ghost finds Hazel Grace and helps her through life while shes struggling with Cancer. He gives her signs when somethings going to happen so shes aware of it. Later on when she gets weaker he tries to help her yet, he cant. And when shes dying, his ghost sits with her in the hospital waiting for the death of Hazel Grace Lancaster to happen. When she finally dies Hazel and Gus are back together again, as ghosts' and in heaven. Hazel's parents are heart broken after her death, so Hazel and Augustus decide to go help them through it so they feel like Hazel is still with them.