In an old and somewhat crumbling mansion, two brothers, Ernie and Lars Smuntz, inherit a property that promises to be their ticket to a life of luxury. However, they soon discover that they are not lucky in their new venture, as the house is infested with a small but cunning visitor: a mouse determined to ruin all their plans. As the brothers desperately try to get rid of their new companion, they embark on a series of hilarious and disastrous strategies, from absurd traps to increasingly wacky entanglements.
The mouse, despite being a simple creature, proves to be smarter than both of them combined, dodging every attempt to catch it and turning their home into a true battleground. As the days go by, the rivalry between the brothers escalates, as each one has their own idea of how to get rid of the tiny intruder. The situation becomes even more complicated when they start uncovering the history of the family legacy and the hidden secrets in the mansion that they hadn't considered before.
With moments of slapstick, physical comedy, and a good dose of craziness, the battle between the Smuntz brothers and the mouse reaches epic levels, ensnaring the audience in a whirlwind of laughter, madness, and ultimately, lessons about family and perseverance. Will these two brothers manage to reclaim their inheritance, or will the little rodent get away with it?