年轻男模大卫以自己的偶像,著名服装设计师奥斯卡为目标,全心投入模特行业,却在一次培训走台时意外摔倒而患上臆想症,从此认为自己是机器侠,到处“行侠仗义”。深爱他的女友朱莉和一群仗义的朋友,有模特公司的同事,还有为了戏剧梦不计报酬的小群演们……他们制定各种方案配合,扮成机器侠世界里的各类臆想出来的角色,从未戳穿真相,外界都以为朱莉才是患有臆想症的人,甚至差点招来公司对手的陷害。奥斯卡出于内疚也暗中相助。直到最后,一次阴差阳错间,大家在行动中碰到了真正的坏人,大卫为保护朱莉受伤昏迷……。When he learns his days are numbered old count Hervé de Kéraudren decides to hide in a secret alcove and to die there, just to annoy his heirs. As a result of his body not being found the latter will have to wait for five years until they can inherit the count's money. Very upsetting indeed, all the more as they are required to keep up the Kéraudren estate in the meantime. To collect money, nephews and nieces organize a Son et Lumière show at the manor while busily looking for the missing corpse. But, unexpectedly, they get killed in turns. Murders or accidents? Jean-Marie, his fiancée Micheline and his cousin Edwige investigate and finally succeed in exposing the culprit. And, the count's body being found by chance, all goes back to normal.。影片根据“老夫子”系列漫画改编而成。。