It's not based on real events. 'The Last Days of Ptolemy Grey' is a piece of fiction that explores various themes and scenarios crafted by the writer's creativity.
It's about the final days of Ptolemy Grey's life. It might involve his personal experiences, relationships, and how he copes with the end of his life journey.
Memory is probably a key theme. Maybe Ptolemy Grey is reminiscing about his past, or perhaps his fading memory is a central part of the story. Also, the theme of self - discovery might be there. In his last days, he could be learning new things about himself that he hadn't realized before.
Perhaps there is a family member, like a grandchild or a niece/nephew who has a special connection with Ptolemy Grey. This person could be important in terms of the emotional support they give or the way they help him face his last days. And there could be a doctor or a medical professional who is involved in his care.