The destructive effects of war
Because Human Voices is set during World War II, which was one of the most destructive wars in human history, the destructive effects of war are one of the most important themes in the novel. Throughout the novel, many people were separated from their loved ones for extended periods of time, countless people died, and many people's lives were destroyed because of World War II. Very few people's lives benefited from the war; many lives were destroyed as a result of the war.
Death
Similarly, death is another important theme in Fitzgerald's novel. In the novel, many people die because of the carnage caused by World War II—loved ones, friends, family, and strangers. So many people lost their lives because of the war. Sam is one of those people who lost his life in the war. Sam, the main character in the novel, is another person who lost his life because of an unexploded car bomb. Sam's death, like the deaths of so many others, is senseless and didn't have to happen. Their deaths solved nothing, the novel argues and didn't need to happen.
Love
Another important theme in the novel is love. It is very clear in the novel that Sam loves (in a non-sexual way) the RPAs that work for him. He cherishes them, their efforts, and their willingness to keep people company in difficult situations. Not only that, Sam grows to love a young RPA named Annie, who professes her love for him one day (their love ultimately turns out to be mutual). It is only because of love that ultimately people are able to continue on with their lives in the face of war.
