The story follows the adventures of its protagonist, John Terence O'Sullivan, who is known as "J. T." throughout the narrative. J. T. is a young man from a working-class background who decides to pursue a life at sea as a tramp steamer sailor, or what was commonly known as an "ocean tramp" during the early 20th century.As J. T. embarks on his journey, he encounters a variety of characters and experiences the hardships and challenges of life at sea. The novel likely offers vivid descriptions of maritime life, including the camaraderie among sailors, the dangers of the open ocean, and the thrill of adventure.