'When Breath Becomes Air' by Paul Kalanithi. Also, here are some authors you may want to check out: Atul Gawande, Danielli Ofri, Oliver Sacks, Theresa Brown, Sandeep Jauhar, Sherwin Nuland. And the list goes on. You can check out summaries of these authors and their books on a website like GoodReads for more information.