Throughout the series, a kind and intelligent Leopold the Cat has to deal with two mischievous mice, Grey and White.
After another trick of mice, Leopold the Cat is visited by a dog doctor who prescribes him to take Ozirin to help him deal with mice. But Leopold doesn't follow the instructions and instead of taking one pill, as written in the prescription, he intakes the whole thing at once and goes wild.
The mice received a treasure map in the mail. In the place indicated on the map, a chest really turned out to be buried, but it also turned out to be something that the mice did not expect.
