由于父亲的去世欧尼和拉尔斯兄弟再次重新相聚，而他们的父亲是一个线厂的商人，于是兄弟二人开始着手继承父亲的家业。拉尔斯的妻子和哥哥都希望卖掉线厂，于是势利眼的妻子在拉尔斯不愿卖掉这份家产的情况下，而被赶出家门，然而一开始有着玩世不恭开餐厅的哥哥却突遭横祸，最终被迫流落街头，无可奈何的兄弟俩人不得已只能搬去父亲留下的老房子去住。谁成想这个一栋破烂不堪的老房子竟然是建筑大师的传世之作，然而本本着发财的想法兄弟二人装修一番，但却在房子发现一只常年居住并对房子有着深厚感情的老鼠。兄弟二人请来外表凶猛的猫、最专业的灭鼠专家，更是亲手制作了精致而杀伤力强大的老鼠夹，然而这一切却都奈何不了这只老鼠，于是在这栋古宅里人与老鼠直接的大战也即将展开

Because of the death of their father, the Ernie and Lars brothers reunited again, and their father was a businessman in a thread factory, so the two brothers started a new life. Set out to inherit his father's family business. Both Lars' wife and brother wanted to sell the thread factory, so the snobbish wife was kicked out of the house when Lars refused to sell the family property, but the brother who had a cynical restaurant at the beginning was Sudden misfortune forced them to live on the streets. The two brothers had no choice but to move to the old house left by their father. Who would have thought that this dilapidated old house turned out to be the handed down work of the master architect. However, the two brothers renovated it with the idea of making a fortune, but found a mouse that lived in the house all year round and had a deep affection for the house. . The two brothers invited a cat with a ferocious appearance, the most professional rodent extermination expert, and even made a delicate and powerful mouse trap with their own hands. A direct battle with mice is about to begin