A young housekeeper is hired to care for an aging mathematics professor who was seriously injured in a car accident causing his short-term memory to last for only 80 minutes. He remembers everything up to the accident, including complicated mathematical theorems and equations, but each day the housekeeper must reintroduce herself to him. When the housekeeper’s 10-year-old son begins to accompany her to the Professor’s house, the three form a unique bond, despite the Professor’s impairment. Translated from Japanese, Ogawa’s novel weaves the complexities of math into a simple, touching story.