Lake Effect frames overcoming deep-seated family betrayal as a difficult, ongoing process that requires confronting grief and guilt, taking accountability, and extending grace. After the initial rift in the Larkin and Finnegan families caused by Nina and Finn’s affair and subsequent elopement, each character embarks on a complicated path to forgiveness. Through the characters’ experiences, Sweeney explores the many ways that forgiveness manifests, allowing for reconciliation and growth.

Throughout the novel, forgiveness often takes the form of action rather than words, especially when characters are emotionally blocked. For example, When Clara is sick with the flu, Nina takes care of her without being asked as a way to make amends, noting, “A meal was an offering, an act of care and intimacy […] She got to work making all of Clara’s favorite nursery foods” (166). While Nina’s efforts don’t immediately earn her Clara’s forgiveness, she does gain more information about the ways in which her actions have hurt Clara, who lost her boyfriend and her role in the school play as a result of her mother’s affair. Years later, when Clara returns to Rochester to care for her dying mother, instead of offering verbal apologies, she mirrors her mother’s form of care in the story, communicating her love and forgiveness through cooking. Cooking food, a skill she once honed as a way to punish Nina for her absence, becomes a way to show deep care. She makes Nina’s favorite foods and fills the house with comforting aromas: “She baked cookies and brownies and an Alsatian tart and made lemon curd and chocolate pudding. She cooked with love, not fear or regret. She put forgiveness into every bowl, love on every plate” (268). The abundance of food Clara makes demonstrates her willingness to finally forgive her mother, allowing her to make amends in the only way she knows how.

Sweeney’s novel suggests that forgiveness requires direct confrontation rather than avoidance, and accountability rather than abdication. Clara’s betrayal of Bridie before the wedding gives Nina the opportunity to confront both Clara’s present mistakes and her own past behavior head on after years of skirting the tension between them. She tells Clara: “For a very long time, I have chosen to let you nurture your disappointment in and anger with me […] I have tried so hard to understand and be accountable for all the ways in which I hurt you and your sister. Your lack of forgiveness has been hard and painful. But this? What you did to Bridie—” (246). By taking accountability for her own mistakes, Nina encourages Clara to do the same. Although she initially responds in anger to Nina’s words, Clara stops herself and apologizes to her mother for the first time: “‘I’m sorry,’ Clara said. ‘I’m sorry I said that. Even I don’t believe it anymore’” (246). Nina’s honesty and Clara’s apology pave the way for their first open conversation about their past.

The novel frames forgiveness as an ongoing and imperfect process that demands repeated effort. When Clara arrives at Bridie’s apartment after her wedding, her peace offering of Bridie’s favorite half-moon cookies is a tentative request for a new beginning between them. She refers to the cookies as “her Proustian snack” (253)—acknowledging a shared memory from their past to build toward their future. Clara reflects that when “Bridie stepped forward and opened the door. It was a start” (253)—a moment that positions forgiveness as a continuous choice to move forward and rebuild what was broken. Similarly, Nina’s final moments frames forgiving oneself as an ongoing practice. Even though she and Fern have shared a close and loving relationship for years, Nina makes sure to acknowledge the pain caused by her elopement, telling Fern, “I owe you an apology […] I looked out the window […] and there you were […] I’m sorry you had to watch us leave” (271-72). Fern’s response—“It doesn’t matter anymore” (272)—and the hospice care she provides for Nina suggest that Fern has long ago forgiven Nina, positioning Nina’s apology as an attempt to forgive herself.