The novel’s protagonist and primary narrator, Caitlin, is a dynamic and round character. Trauma, guilt, and the search for an authentic identity define her journey. Sixteen years after witnessing the abduction of her older sister, Olivia, Caitlin lives in Olivia’s “long shadow,” a state of perpetual penance for her perceived failure to act that night. This guilt shapes her adult life, making her compliant and eager to please, particularly in her relationship with her mother, for whom she sacrifices her own ambitions. She pursues a teaching degree instead of art and forgoes her dream of traveling abroad, all to remain a source of stability for her grieving parents. This deference highlights her initial passivity: She allows others to define her existence, even adopting her fiancé’s surname before marriage to escape the notoriety of being “Caitlin Arden, sister of the missing Arden girl” (10). Her secret art business, Wanderlust Illustrations, is the sole outlet for her true self, a small rebellion against the life she feels obligated to lead.

Olivia’s return catalyzes Caitlin’s transformation. Initially overjoyed, Caitlin’s sharp instincts lead her to question the woman’s identity and motives. As Olivia systematically isolates her from her parents, her best friend, Florence, and her fiancé, Oscar, Caitlin is forced out of passivity.