This document summarizes the theme of suicide in Julian Barnes' novel The Sense of an Ending. It discusses two characters in the novel, Robson and Adrian, who commit suicide. It provides details on their suicide notes - Robson left a brief note saying "Sorry, Mum" while Adrian's reason for suicide was revealed in his diary. The document then discusses real-world examples of suicide notes and reasons for suicide from news reports. It introduces Emile Durkheim's classification of the different types of suicide. In conclusion, it asks the reader's perspective on what defines suicide and whether suicide notes are always necessary.