The book presents the life story of a cat living in a big city, who after being adopted by a little old lady named Mirou, was given the name Milu.
Milu is a very playful cat, and what he wanted most was to walk around the city, see new sights, climb trees, jump on the roof, run away from the dogs, eat other cats' food, and make new friends.
But his owner never lets him out of the house, and one fine day she forgot to open the door, and Milu went out, and right away he ran into a huge dog named Mingau. Want to know how the story ends? Read the book!