"A Sub. of the R.N.R: A Story of the Great War" by Percy F. Westerman is a gripping adventure novel set during the tumultuous times of World War I. Westerman's narrative follows the exploits of a Royal Naval Reserve officer as he navigates the challenges and dangers of naval warfare. The novel vividly captures the intensity and heroism of naval battles during the war and provides readers with a thrilling and historically accurate portrayal of the era. For those interested in military fiction and the history of World War I, "A Sub. of the R.N.R" offers a compelling and action-packed reading experience.