As the story opens, Heidi is left in the care of her grandfather in his secluded mountain hut. The narrative highlights Heidi's immediate fascination with her new surroundings. Rather than mourning the departure of Data, she is consumed by a desire to explore, investigating the shed and the pine trees that surround the hut. Her interaction with her grandfather is characterized by a mix of curiosity and independence. When asked about her bundle of clothes, Heidi expresses a desire to live freely, stating, "I want to run around like the goats with their thin, light legs." This sentiment underscores her rejection of societal constraints in favor of the natural, unburdened existence offered by the mountain lifestyle.
Heidi’s integration into the hut is marked by a series of domestic discoveries. She explores the "good-sized room" that serves as the heart of the home, discovering the fireplace, the kettle, and the cupboard where the grandfather keeps his provisions. A pivotal moment occurs when Heidi insists on storing her clothes away, effectively shedding her past life to fully embrace her present. Her proactive nature is further demonstrated when she seeks out her own sleeping quarters. Upon climbing a "short ladder" to the hayloft, she finds a "large heap of fresh, sweet-smelling hay" and declares, "I shall sleep up here."
Despite the grandfather’s initial stoic demeanor, a collaborative bond begins to form between them. They work together to transform the hayloft into a comfortable living space. The grandfather provides a "long, rough piece of material" for a sheet and a "large, thick sack" for a cover. Heidi’s reaction to this makeshift bed—"squealing with delight"—reveals her capacity for joy and her deep appreciation for simple comforts. This shared labor signals the beginning of a genuine connection, as the grandfather begins to accommodate Heidi’s needs, even participating in the "excitement of bed-making."
As the day progresses, Heidi finds rhythm in the mountain life. She observes her grandfather as he prepares the goat shed, putting in "fresh straw" for the animals. The arrival of the goats, described as "springing down from the mountaintops," introduces Heidi to "Little Swan" and "Little Bear." Her interaction with these animals highlights her innocent, joyful spirit; she greets them with "glee," reinforcing her role as a creature of the mountains who feels right at home among the "slender animals."
The story concludes with a shift in tone from the day's excitement to the quiet vulnerability of the night. While the mountain environment can be harsh—with "strong winds" causing the hut’s beams to "groan and creak with anger"—Heidi remains undisturbed, sleeping "sweetly and soundly." The narrative ends with a poignant scene: the grandfather, concerned that "a child will be frightened," climbs to the loft to check on her. Finding her with "cheeks rosy" and a "smile on her face," the old man’s silent vigil reveals a hidden depth of care. His observation of her peaceful, pleasant dream serves as a testament to the safety and security he has successfully provided for her, marking the successful establishment of a new, protective bond between the two.