The novel 'Today I Married My Best Friend' may focus on the unique journey of the main characters. Since they start as best friends, they probably have a deep understanding of each other. The story could be about their new experiences in married life, such as dealing with in - laws, sharing finances, and also maintaining the friendship aspect while being husband and wife. It might also show how their friendship helps them overcome difficulties in their marriage.
I haven't read this novel specifically, but generally, it might be about two people who are best friends and then their relationship evolves into a romantic one leading to marriage. It could explore how their friendship foundation affects their married life, like how they handle problems differently compared to other couples because of their prior deep friendship.