59 pages • 1-hour read
A modern alternative to SparkNotes and CliffsNotes, SuperSummary offers high-quality Study Guides with detailed chapter summaries and analysis of major themes, characters, and more.
Content Warning: This section of the guide feature depictions of anti-gay bias, bullying, and emotional abuse.
Morgan Kwon is a 15-year-old girl caught between who she is and who she believes she must pretend to be. The artwork reinforces this tension: She appears tall, slim, and expressive, yet her posture consistently curls inward. Hunched shoulders, guarded arms, and downcast eyes signal how rarely she feels at ease, even in spaces meant to be safe. Her diffident, self-protective posture conveys her emotional uncertainty, suggesting that she moves through the world bracing for impact.
Morgan’s life is in a period of transition: Her parents have separated, her brother, Aiden, is frequently angry, and she has realized that she is gay but is not yet ready to come out. She deals with these stresses by imposing strict order on herself. She divides her life into “boxes”—keeping her love life separate from her family and friends, and keeping her happy childhood memories walled off from her more emotionally turbulent adolescence. Her past becomes a sealed container she romanticizes, the present turmoil at home becomes something to endure or escape, her friendships become a performance, and her future becomes the only place where she imagines she can live openly. These boxes give Morgan the illusion of stability but demand that she erase parts of herself. She silences her opinions, stops making clothes because they feel “too weird,” and even narrates her school persona in third-person, as if that version of herself is a stranger she must impersonate.
This pattern of hiding carries real emotional cost. Morgan blends in rather than belonging, and secrecy hollows out her closest relationships. She protects herself by withdrawing, but the protection doubles as isolation. The contrast between how she currently hides in plain sight and how she once “shone through the water like the moon” illustrates how much of herself she has buried to survive adolescence (91).
Morgan’s transformation begins when she can no longer maintain those divisions. As she confronts the expectations she has placed on herself, she discovers that she can choose to live a full life in the present, rather than putting her life off for an idealized future. Her growth lies not in becoming someone new, but in reclaiming the person she already is. That shift toward openness, honesty, and emotional risk, prompted a series of dramatic changes in her life, embodies the novel’s core theme of Change as a Catalyst for Personal Growth.
Keltie is a selkie, a mythological seal-woman whose ability to shift between forms shapes both her identity and her role in the story. She appears roughly Morgan’s age, but her body and bearing immediately set her apart. Keltie has a compact, strong build that reflects a life shaped by the tides. Her physical confidence contrasts sharply with Morgan’s tense, inward posture. Her long, wavy blond hair reinforces her wild, free-spirited energy, suggesting someone who belongs as much to the ocean as to the land.
Keltie spends most of her life as a seal, a generational trait shared with other selkies, including Earl, who hints at the long lineage of selkies around the island. Every seven years, she can loosen her seal-skin enough to appear human, though she must remain in the water. Morgan’s kiss, however, binds her fully to the land, giving her a level of transformation she has never experienced before.
As a character, Keltie serves as a clear foil to Morgan. Where Morgan is rigid, careful, and boxed in, Keltie is exuberant, open, and guided by instinct. She says what she feels, expresses affection without hesitation, and approaches human customs with a guileless curiosity. Even their approaches to conflict reveal their differences. Morgan seeks conversation and compromise, while Keltie speaks her mind impulsively. By voicing her disgust with the tour boat to Serena, she undermines her own cause, alienating the one person who could help her. When Serena refuses to help, Keltie further demonstrates her impulsiveness by trying to wreck the boat.
However, Keltie’s impulsivity is matched by her capacity for accountability. When her actions endanger everyone, she admits her mistake and takes action to fix it. She also confesses that she needed Morgan’s kiss in order to remain on land to help the seals, a motive she initially hides for fear that Morgan will not believe her feelings are real. Most strikingly, although she does not particularly like Serena, she takes responsibility for the accident that caused Serena’s fall into the sea. Knowing that only her seal form can save her, Keltie willingly puts on her seal-skin, accepting that this choice will trap her in the ocean, away from Morgan, for another seven years.
This willingness to sacrifice her own desires for others’ sake highlights Keltie’s emotional depth and moral clarity. She embodies transformation not only through her mythic shifting but through her growth: She learns that love requires honesty, accountability, and courage. Through her actions, Keltie becomes a catalyst for Morgan’s own transformation, showing how authenticity and responsibility can reshape not only the self but the relationships around it.
Each member of Morgan’s friend group, Serena Boisseau, Lizzie, and Jules, initially appears to fit a familiar archetype of teen girlhood: Serena as the stylish “girly one,” Jules as the jokester, and Lizzie as “the sweetest person ever” (48). The artwork reinforces these impressions: Serena is polished and trendy; Jules is tall and relaxed with bright red hair; and Lizzie’s facial expressions convey her empathy for others. Collectively, the group functions as Morgan’s emotional anchor, even when they struggle to reach her.
Much like the Kwon family, Morgan’s friends sincerely want to support her but cannot do so when she doesn’t communicate openly with them. As Morgan withdraws into secrecy, they worry collectively in a separate chat, aware that she is navigating a painful year due to her parents’ recent separation. They sense something is wrong but grow frustrated as Morgan keeps them at arm’s length.
Serena’s role is especially central. She makes the most effort to keep Morgan included, sending separate reminders and reaching out when Morgan stops responding. Her hurt runs the deepest because she believes they share a uniquely close bond. At the same time, Serena faces her own quiet loneliness as her parents repurpose her birthday party for publicity, ignoring her discomfort with large crowds. When Morgan pulls away without an explanation, Serena feels abandoned by one of the few people she trusts. Her sharp words during their confrontation stem from her longing to reconnect with Morgan.
Lizzie expresses her concern differently. She misreads Keltie’s sudden appearances as signs of danger, believing Keltie is stalking Morgan, and she seeks help from Serena and Jules to protect Morgan. Even Aiden confides in her about Morgan’s behavior. However, the moment Morgan tells the truth, Lizzie’s fear transforms instantly into excitement, “You’re having a SECRET SUMMER ROMANCE” (172). Her reaction shows how fully she accepts Morgan once she finally shares her real life with them.
Together, the friend group illustrates the novel’s broader theme of identity and transformation. When Morgan chooses honesty, even imperfectly, her friendships not only survive but begin to deepen, proving that authentic connection thrives on being seen, not on blending in.
The Kwon family embodies the novel’s exploration of identity and change. Morgan explains that “Dad moved to the city after months of arguments,” implying a backstory of domestic strife prior to the novel’s opening (7). His absence reshapes how each member sees themselves and each other. The story presents the father as a gravitational force, someone whose departure unbalances the household and intensifies the pressure on those who remain.
Morgan feels this absence most intensely as claustrophobia. Her home ceases to be a refuge; instead, she longs to flee the tension between her grieving mother and angry brother. The emotional distance she cultivates, her “boxes,” mirrors the physical distance her father created by leaving. As a result, Morgan internalizes the idea that safety lies elsewhere: in the future, in secrecy, or in fantasy. Her journey through the novel becomes one of relearning closeness, a process that begins with Keltie but ultimately depends on repairing her family ties.
Aiden responds to his father’s absence with anger, which masks his fear of being left behind. He lashes out at Morgan, not because he dislikes her, but because she becomes the most accessible outlet for feelings he cannot articulate. His rage contrasts with earlier images of sibling tenderness, such as Morgan holding him as a baby, or the two playing together on the beach. These memories highlight what has been lost, not only between them but within Aiden himself. His fear of abandonment leads to a significant betrayal when he outs Morgan to their mother. His eventual apology, “I was trying to get your attention. And being the biggest jerk in the world” signals his growing self-awareness (155). Helping Morgan make the dress becomes a moment of reconnection, allowing Aiden to atone for his mistakes and strengthening their bond.
Min carries the dual weight of single parenthood and her own grief. She worries deeply about her children, but her preoccupation with holding the family together prevents her from recognizing to the emotional distance Morgan is cultivating. Her tendency to let Morgan hide is less neglect than exhaustion. However, Min’s heartfelt support for Morgan during her coming out reveals her capacity for empathy. She acknowledges her missteps, encourages Morgan’s honesty, and reframes messiness as necessary for growth.
Together, the Kwons illustrate that families transform through the difficult work of recognizing one another clearly, something each of them must learn in the father’s absence.



Unlock analysis of every major character
Get a detailed breakdown of each character’s role, motivations, and development.