Ernie (Nathan Lane) & Lars (Lee Evans) Smuntz are brothers whom part own a once bustling string factory, started by their father and now failing miserably.
When an old man dies and leaves the boys his house in the will, the brothers see a way out of their financial crisis.
Making plans to sell off the land for development the brothers get a visit from an archetect who points out that the house has, in fact, been designed and built by a famous architect of days gone bye. Known as the lost design the house is now worth millions.. now the brothers can see only dollar signs.
However the run up to the auction and beyond it isn't as easy as once thought due to a tenant who refuses to leave.. a mouse!!
Now the boys must rid the house of the mouse who won't go.
High hilarity for all the family in this brilliant film.