So B. It

Heidi sits in the Sheriff's office with a jar of jelly beans, feeling trapped and wishing for freedom. Sheriff Roy Franklin engages her in a coin-guessing game, which reveals that someone named Bernie has called for her, indicating she won't be booked as a runaway.

At a bus terminal in Reno, Heidi encounters a punked-out girl and persuades her to buy a bus ticket. This ticket is crucial for Heidi's escape, as she is traveling to Liberty, New York, with her collection of silver dollars.

Heidi offers assistance to Alice Wilinsky, an elderly woman struggling with her groceries, so she can travel discreetly. Despite the bus driver's suspicion, Heidi boards the bus, hoping to continue her journey without drawing attention.

Heidi recalls moments with Bernie at home, where they navigate her mother's mental disabilities and create lesson plans. Their relationship is highlighted, showcasing Bernie's love for Heidi and their day-to-day challenges.

Heidi, Mama, and Bernie practice going to the bus stop in their home to confront Bernie's agoraphobia. This exercise reveals the struggles they face as Heidi attempts to help her family overcome their fears.

As Heidi remains curious about her mother's condition, she keeps a list of words which includes 'soof.' This symbolizes her desire to understand her mother's past and the frustrations that arise from it.

Amidst a storm back home, Heidi tries to call her mother but the connection fails. As Bernie's anxiety rises, Heidi realizes she must venture out despite the dangers to protect her family.

Again on the bus with Alice, Heidi struggles with the lies she has created about her family. Ultimately, her deception is uncovered, resulting in her emotional isolation and pushing her further into solitude.

Upon reaching Hilltop Home, Heidi is hopeful but quickly encounters hostility from Thurman Hill. When she learns about her mother’s past and the circumstances surrounding her family, her world begins to unravel.

Meanwhile, back at home, Bernie struggles to calm Mama, who is scared and unwell. This parallel struggle signifies the urgency of Heidi’s quest for identity and family.

Heidi learns from Mr. Hill about her mother's true name, Sophia Demuth, and the family dynamics that led to her upbringing. This shocking revelation significantly impacts her understanding of her identity.

As Heidi learns more about her past, Bernie faces a heartbreaking moment as Mama passes away. This loss deeply affects Heidi, creating a gap in her life that she struggles to fill.

At Mama's burial, Heidi reflects on the significance of 'soof' and the love tied to that name. This moment brings a sense of closure as she begins to understand her family's legacy.

In her grief, Heidi starts a new list titled 'THINGS I'LL MISS ABOUT MAMA,' with her only entry being 'EVERYTHING.' This act symbolizes her processing of loss and the deep bond they shared.

Finally, after reflecting on her experiences, Heidi returns home where she finds a transformed Bernie who can now leave the house. This marks a new chapter in both their lives as they rebuild their relationship.