What is the Morden tragedy?
If you mean modern tragedy, there is more than one. There is a vast literature on the subject of modern tragedy, and you might start your research on the Wikipedia article: The section on modern tragedy is brief, but references several key ideas. I also found this on Amazon: Here is a link to the authors biography on Wikipedia: The title of the book on Amazon is misspelled. It should be modern. There is no morden tragedy.