Hannah serves as the protagonist and first-person narrator of the novel, providing a cautious and grounded perspective that contrasts sharply with the escalating chaos around her. She develops from a reserved and anxious teenager into a more confident and decisive survivor over the course of the narrative. Initially, Hannah is defined by her pragmatism and her deep-seated loyalty to her best friend, Emmy. Her long-standing, unrequited crush on Emmy’s brother, Jackson, reveals a vulnerability and romanticism that she otherwise keeps hidden beneath a guarded exterior. Her tendency toward anxiety is established early, as she reflects, “I get anxiety when I have to drive somewhere new and don’t know the parking situation” (5). This trait makes her initially skeptical of both Ben and the ill-fated boat trip, positioning her as the group’s voice of reason.

As the idyllic vacation devolves into a life-or-death struggle, Hannah’s latent strengths come to the forefront. Her background as a lifeguard becomes a crucial resource that she draws upon to save herself and her friends. When Captain Keith goes overboard, she’s the only one who attempts a rescue, demonstrating her inherent sense of responsibility.