However, this new dynamic is not without tension, and it is here that Crossan’s narrative is most insightful. The arrival of an external friend inevitably creates a new kind of intimacy—and a new kind of jealousy. May, who has always been the center of their shared world, feels threatened. Brenna’s attention on Maddy feels like a subtraction from her. This jealousy is not petty; it is a realistic portrayal of a conjoined twin’s fear of being left behind emotionally, even when physical separation is impossible. The sacrifice required here is profound. For Maddy to grow, May must learn to share—not just a body, but a heart. For May to feel secure, Maddy must prove that her new friendship does not diminish her love for her sister. Brenna, in turn, must navigate the delicate line between being a supportive outsider and unintentionally causing division.
Ultimately, what makes this trio so powerful is that Brenna does not try to break the twins apart. Instead, she strengthens their bond by validating their individuality. She becomes a translator of sorts, helping each twin see the other more clearly. When Maddy feels invisible, Brenna encourages her to speak. When May’s health deteriorates, Brenna is a steady, non-judgmental presence for both of them. The most profound lesson of One is that family is not diminished by expansion. Brenna does not replace May; she adds a new layer of love and support. In the devastating final act of the novel, when the twins undergo a life-changing separation surgery, it is the memory of Brenna’s friendship—of a world outside their twin bubble that accepted them completely—that gives Maddy and May the courage to face the unknown. maddy may brenna
Initially, the twins exist in a closed, symbiotic system. Maddy is the quieter, more introspective twin, while Grace (May) is the extroverted, medically fragile one. Their world is one of mutual reliance and silent understanding, but also of limitation—they have been homeschooled and sheltered from social judgment. Brenna’s entrance disrupts this equilibrium. She is bold, unapologetically herself, and crucially, does not treat the twins as a spectacle. She sees Maddy and May as two distinct people. This is revolutionary for them. For the first time, Maddy experiences a friendship that is hers —not shared in the same way everything else is. Brenna’s presence gives Maddy the space to articulate feelings she might otherwise suppress to protect May, and it offers May a friend who sees her fiery spirit, not just her physical vulnerabilities. However, this new dynamic is not without tension,
In Sarah Crossan’s verse novel One , the lives of conjoined twins Maddy and Grace are irrevocably changed by the arrival of an unexpected new student: Brenna. While the novel primarily orbits the profound bond between Maddy and Grace, the introduction of Brenna serves as a crucial catalyst for the twins’ individual development. Through the evolving dynamic of Maddy, May (Grace’s nickname), and Brenna, Crossan explores essential themes of identity formation, the nature of sacrifice, and the definition of true family. Far from being a simple story of friendship, the trio’s relationship reveals how genuine connection can challenge, support, and ultimately liberate us. Brenna’s attention on Maddy feels like a subtraction
