Jack Keefe, a brash and self-absorbed bush league pitcher, attempts to navigate the professional pressures of the Chicago White Sox while maintaining his inflated sense of self-importance. Keefe’s objective is to secure his position in the major leagues and manage his chaotic personal and financial affairs, all while dealing with the skepticism of his teammates and managers. The narrative is presented entirely through a series of letters written by Keefe to his friend Al back home, which creates a stark contrast between the protagonist's boastful perception of his talent and the reality of his struggles. These letters serve as the primary framework, exposing Keefe's lack of self-awareness and his constant need for validation.

Readers and critics frequently highlight the effectiveness of Lardner’s use of vernacular to establish the protagonist's distinct voice and limited perspective. Discussion often centers on the humor derived from Keefe’s inability to recognize his own flaws, which provides a sharp critique of the era's sports culture. The pacing is noted for being consistent with the episodic nature of the letters, allowing for a steady progression through Keefe's career challenges. Many observers appreciate how the book balances the technical aspects of baseball with the personal failings of the narrator, creating a character study that remains relevant to the genre. The work is widely regarded for its influence on the development of American satirical writing and its authentic capture of early 20th-century speech patterns.