一只名叫蒂诺的小猫，看尽巴黎的白天与黑夜。白天，它是小女孩佐伊（Oriane Zani 配音）宠物，每天早上为她带来小礼物。佐伊的父母都是警察，父亲被城中最大的恶棍维克托·科斯塔（Jean Benguigui 配音）杀害，母亲让娜（Dominique Blanc 配音）发誓将科斯塔绳之于法，渐渐忽略了对佐伊的关怀。小佐伊从此封闭了自己，不发一言。每到夜晚，蒂诺便跳出窗户，寻找它另一个生活在黑夜的朋友尼克（Bruno Salomone 配音）。尼克是一个身手敏捷的大盗，他神出鬼没，手法娴熟，不过蒂诺是他唯一的朋友。蒂诺穿梭往来，成为了两个完全不同的人儿间的奇妙纽带。 　　某晚，佐伊跟着蒂诺溜出房间，却意外遭遇企图抢劫展览馆石像的科斯塔团伙。佐伊、尼克和让娜纷纷被卷入其中……Dino is a cat that leads a double life. By day, he lives with Zoe, a little girl whose mother, Jeanne, is a police officer. By night, he works with Nico, a burglar with a big heart. Zoe has plunged herself into silence following her father's murder at the hands of gangster Costa. One day, Dino the cat brings Zoe a very valuable bracelet. Lucas, Jeanne's second-in-command, notices this bracelet is part of a jewelery collection that has been stolen. One night, Zoe decides to follow Dino. On the way, she overhears some gangsters and discovers that her nanny is part of the gangsters' team.