"The Secret Service Submarine: A Story of the Present War" by Guy Thorne is a fictional novel written during the early 20th century, likely in the context of World War I. The story revolves around John Carey, a young man hoping to enlist in the war, whose rejection leads him into a tangled web of espionage and intrigue involving his enigmatic headmaster, Dr. Upjelly, and his brother, Bernard, who is a lieutenant-commander in the submarine division. The narrative hints at themes of patriotism, sacrifice, and the personal struggles of those trying to serve their country in unusual circumstances. At the start of the book, we meet John Carey, who reflects on his life as he grapples with the failure to enroll in the military due to a leg injury. His mundane existence as a schoolmaster at Morstone House contrasts sharply with his longing for action and significance in the war. The opening chapters introduce various characters, including the domineering headmaster and John's romantic interest, Doris, with whom he maintains a secret relationship. Tension builds as Bernard visits, and discussions arise about shadowy figures, potential spy networks, and the mysteries surrounding Dr. Upjelly's intentions, setting the stage for a gripping narrative of espionage and adventure. (This is an automatically generated summary.)