A brilliant maths Professor, due to a head injury, lives with only eighty minutes of short-term memory. An astute young Housekeeper, with a ten-year-old son, is hired to care for him. Each morning, they're reintroduced. Despite his memory loss, the Professor's mind is filled with past mathematical equations. He creates clever maths riddles based on her personal details, revealing a poetic world to both the Housekeeper and her son. With each new equation, a mysterious affection and deep bond forms between them, transcending memory.