In The Worst Best Man, Lucy Score makes a case for The Importance of Loyalty by making it one of the most important aspects of all the loving relationships that develop. Aside from the physical chemistry, the shared trait of loyalty is the glue that initially binds Frankie and Aiden together as they work to make their mutual friends’ wedding a success. After this initial discovery of their shared value, each character makes powerful gestures that highlight how important loyalty is to their relationship, and these gestures escalate considerably as the novel progresses. For example, while Frankie begins by mildly defending Aiden as a “nice guy” in one scene, she eventually becomes willing to bash someone over the head for insulting Aiden. Likewise, Aiden goes from verbally correcting Margeaux to throwing all the weight of his money and power behind Frankie when a man dares to threaten her, even going so far as to buy the man’s company. Thus, Frankie and Aiden essentially speak the same love language of loyalty.

It is also important to note that the theme of loyalty manifests in multiple ways, and Score uses various secondary characters to illustrate the fact that loyalty is just as important among family members as it is between lovers.