Arrietty writes in her diary as she and her mother wait for Pod to return from borrowing. Arrietty knows that Homily is super worried about him.
When Pod returns, he and his wife decide they have something important to tell their daughter: that Pod was "seen" by a boy, and that the upstairs world is very dangerous. They tell her the story of her own cousin, Eggletina, who was eaten by a cat. Eesh.
Our little rebel with a cause gets angry with her parents for keeping her cooped up until finally Homily convinces Pod to take her borrowing.
When Arrietty and Pod see the world upstairs, Arrietty is flabbergasted by all the wondrous things like grass and sunlight.
But things take a turn for the terrifying when she comes face-to-face with a giant eyeball. She soon realizes that the Eye belongs to a boy, and the two become friends.
Arrietty promises to read to the boy, and the boy promises to bring Arrietty's extended family a letter in the fields.
Busted! All is good until Pod goes borrowing again and catches Arrietty and the boy hanging out.
Arrietty's parents majorly freak out when they discover that she is hanging out with a human, and that very night their worst fears come true: the roof is lifted off their house by the boy.
Instead of it being a disaster, though, a beautiful friendship of borrowing begins as the boy brings them things from the dollhouse.
But then disaster strikes. Mrs. Driver discovers the borrowers' home and threatens to call the police, cats, dogs, and rat-catchers.
The boy comes to help them escape to the fields, but he's locked in his room by Mrs. Driver.
And that's where the story ends.
Still, Mrs. May and Kate imagine that the borrowers get out after the boy knocks a hole in the grate, and that they live with their extended family in the fields.