A young girl and her grandmother navigate the complexities of life and mortality while spending a summer on a remote island in the Gulf of Finland. Sophia, a six-year-old child, and her grandmother, an elderly woman nearing the end of her life, occupy a tiny, isolated island. Their relationship is defined by mutual care, curiosity, and the physical constraints of their rugged, natural environment. The narrative unfolds through a series of vignettes that capture the daily rhythms of their existence, focusing on their interactions with the landscape and each other.

Readers frequently highlight the quiet, meditative quality of the prose and the effectiveness of the island setting in grounding the narrative. Discussion often centers on the unsentimental portrayal of the bond between the grandmother and granddaughter, which avoids typical tropes of childhood innocence or elderly frailty. Critics appreciate the balance between the characters' internal reflections and their external activities, such as building boats or studying local insects. The work is often described as a precise, atmospheric examination of human existence within the natural world. Many readers find the lack of a conventional plot to be a strength, allowing the focus to remain entirely on the subtle shifts in the characters' perspectives over the course of the summer.