Detective Spinoza, a rumpled and disheveled sheepdog from the City, has been summoned to Farmsville to help his old friend Judge Bogart, an old saddle donkey, investigate the death of a little mouse found on the floor of the great barn. While everything points to poison as the cause, Detective Spinoza doesn't seem interested in the obvious suspects – the black widows, snakes and toads. Instead, the detective continues to nose around the barn looking for another explanation, much to the annoyance of the master feline of the loft, the tabby cat Madame Sylvester Sloan. Join the fun as the persistent detective seeks to uncover the truth about the poor rodent's untimely demise.