Los incursores

Arrietty is smaller than a sugar cube. But she is very brave, because with a needle for a sword, she must save her entire family, with whom she lives beneath the floorboards of an old mansion. They are the Borrowers. They own nothing, and so they must embark on dangerous adventures every time they want to "borrow" something from the owners of the house: the enormous "humans." Until Arrietty meets one of them, a very special boy. And their lives change forever.