In The Unnatural Death, Captain Bailey Ashford finds himself in Puerto Rico, where the aftermath of the Spanish-American War has left the island in turmoil. An alarming epidemic is sweeping through the population, and the local people are increasingly convinced that the American occupation is exacerbating their suffering. Ashford, a dedicated doctor, is called upon to help combat this crisis, but he faces significant challenges as he tries to locate a fellow doctor who has gone missing amidst the chaos.