The central focus of The Heat of the Day is on the intricacies of personal relationships. The novel includes several examples of how the wartime context drastically affects the ways people interact with each other, thus revealing the interpersonal aspects of war’s domestic consequences.

Relationships are sometimes amplified in importance because of their wartime context. Barriers between people decrease, given the dangerous wartime situation, and “[t]he wall between the living and the living became less solid as the wall between the living and the dead thinned” (99-100). More specifically, Louie’s actions indicate the increased importance that can be accorded to otherwise insignificant relationships in wartime. Her loneliness motivates her to continually speak to Harrison, though he clearly rebuffs her. Her decision to seek a series of lovers is also motivated by her husband’s absence with the army, as “the impulses of incredulous loneliness died down in her […] [which] had made her look for her husband in other faces” (160). The process of seeking connection is portrayed as an attempt to counter the isolation war can produce.

Stella and Robert’s relationship is also contextualized entirely by war. They meet during the Blitz, with their very first conversation interrupted by bombings. The wartime context dictates their decision not to marry, and Stella acknowledges that their relationship may only be possible because of the war. There are also many subtle hints in the novel that their relationship was never as open or as close as Stella initially believes it to be: She is not at ease with Robert’s family, which suggests that she still does not actually know them very well. Stella also often experiences her dynamic with Robert as something that reminds her of fiction: “[Stella] felt herself to be going to a rendezvous inside the pages of a book. And was, indeed, Robert himself fictitious?” (106, emphasis added). Stella’s musings that Robert could be “fictitious” implies that she may not know Robert as well as she thinks she does, even when their relationship still appears outwardly normal. When Robert admits to his treachery, Stella feels lost, torn between her feelings for the man she believed she loved and her sense that his behavior is unforgivable.

The Heat of the Day does not offer any easy resolutions to these interpersonal dilemmas. Louie becomes pregnant with another man’s child, hearing of her husband’s death just as she considers breaking the news to him. Stella ends the novel telling Harrison she is going to marry someone new, but she does not reveal much about how Robert’s death may have continued to impact her emotionally. The novel thus suggests that war impacts even the most intimate of bonds in irrevocable ways, large and small.