A sailor struggles to maintain his humanity and identity while trapped within the rigid, oppressive hierarchy of a nineteenth-century naval warship. The protagonist, known by the nickname derived from his makeshift coat, navigates the brutal daily routines and autocratic command structure of the USS Neversink. He faces constant physical danger, the threat of arbitrary corporal punishment, and the psychological strain of life in a confined, male-dominated environment. The narrative utilizes a first-person perspective to provide an intimate, observational account of life at sea, blending personal experience with broader social critique.

Readers and critics frequently note the book's effectiveness in exposing the harsh realities of naval life during the mid-nineteenth century. Discussion often centers on the author's ability to balance vivid, realistic depictions of maritime labor with a biting critique of institutional cruelty. Many highlight the protagonist's white jacket as a central symbol that underscores his alienation from the rigid military structure. The pacing is often described as deliberate, allowing for deep immersion into the atmosphere of the man-of-war. Scholars frequently emphasize the work's importance in understanding the author's broader thematic concerns regarding authority and human rights.