Two brothers live together by the edge of the forest and spend their days, contentedly, chipping stones into building blocks. One day, in return for their help, an old woman grants them seven wishes.
Anatole, the mouse, returns from vacation to find he is sorely needed to help solve the mystery of the Great Cheese Robbery which has closed his good friend's cheese factory.
Basil, mouse and master detective seeking for the truth behind the theft of the Mousa Lisa, must also solve the mystery of his companion's disappearance.
Headed for the Grand Canyon to investigate a mystery at a hotel, Basil finds himself involved in dangerous adventures as he tries to foil the schemes of a ruthless smuggler.
