In 1902, in London, spinster Beatrix Potter (Renée Zellweger) lives with her bourgeois parents. Her snobbish mother, Helen Potter (Barbara Flynn), had introduced several bachelors to Beatrix until she was twenty-years-old, but she had turned them all down. Beatrix Potter has been drawing animals and making up stories about them since she was a child, but her parents have never recognized her as an artist. One day, Miss Potter offers her stories to a print house, and a rookie publisher, Norman Warne (Ewan McGregor), who is delighted with her tales, publishes her first children's book. This success leads Norman to publish two other books, and Miss Potter meanwhile becomes the best friend of his single sister Millie Warne (Emily Watson). Soon Beatrix and Norman fall in love with each other, but Helen does not accept that her daughter would marry a "trader". However, Beatrix's father Rupert Potter (Bill Paterson) proposes that his daughter spend the summer with his wife and him in their country house in Lake District, and if she is still interested in Norman after the summertime, he would bless their marriage. When Miss Potter stops receiving letters from Norman, she is disappointed. Then one day she receives a letter from Millie explaining what had happened to Norman.