María, one of the heroines of this story, learns that her aunt Matilda is coming to live with her family. After adapting to the change this represents for her, she starts to enjoy her aunt's company and peculiar habits. In the course of a single day she discovers all they can share and the secret her aunt is hiding. This is a story full of love and innocence which allows us to thank older people in some way for everything they once did for us. It shows children the importance of empathy and generosity and helps them learn about Alzheimer's or other forms of dementia in a gentle way. This is a picture book full of feelings, music and stories where each detail explains the true worth of a memory.