The setting is more than just a background; it is a character in its own right. Martins utilizes iconic locations like Montmartre and the artists' quarter to facilitate the emotional opening of his protagonists. The "magic" of Paris—enhanced by the holiday season of Christmas Eve —acts as a catalyst that forces these two strangers to see the world through each other's eyes. The use of rain and drizzle in the opening scenes creates a sense of shared intimacy, isolating them from the rest of the world and grounding their experience in the present moment.

, conversely, is a global traveller with an "endless curiosity". He is outgoing, friendly, and comfortable in the transient spaces of airports and planes—a stark contrast to Matilde, who has never even set foot on an aircraft.

The title's emphasis on "twelve hours" establishes a ticking clock that heightens the narrative tension. Martins suggests that deep emotional connections do not necessarily require years to form; instead, an "intense" period of vulnerability can be just as impactful. The essay of their meeting is essentially a study in perspective shift : Matilde’s "grey vision" of life is gradually filled with colour through Harry’s influence, suggesting that love and connection are often found in the places we least expect.