The Shadow-Line is a novel based at sea by Joseph Conrad. The novella has often been cited as a metaphor of the First World War, given its timing and references to a long struggle, the importance of camaraderie, etc. This viewpoint may also be reinforced by the knowledge that Conrad's elder son, Borys, was wounded in the First World War. Others however see the novel as having a strong supernatural influence, referring to various plot-lines in the novella such as the 'ghost' of the previous captain potentially cursing the ship, and the madness of first mate Mr Burns. Conrad himself, however, denied this link, claiming that although critics had attempted to show this link, "The world of the living contains enough marvels and mysteries as it is."