A black cat with red stripes has a double life. During the night, he accompanies a burglar named Nico (who calls him Mr. Cat), who makes heists to steal jewels. During the day, he lives with a small girl named Zoé (who calls him Dino). Zoé has become distant from her mother Jeanne, who works as a police superintendent, and lost her voice since the loss of her father and is looked after by a lady named Claudine.