Someone is drawing moustaches on the great works of art at the Louvre Museum and Cousin Gaston seeks help from the mice to find out who is responsible.

The mice are visiting Cousin Agatha and plan to attend Queen Victoria's Golden Jubilee celebration, but things go awry when the diamond from the Queen's crown is stolen.

The Mice will travel to Munich for the premiere of Strauss's latest symphony; Cousin Otto, also known as the Waltz Mouse, notices that the notes of the symphony have been exchanged for another, nightmarish-sounding work.

Alexander and Emily are going to witness an air race from London to Paris in which Cousin Gaston plans to win; there's also a human race that Gaston's friend Carole and her father hope to win.

The mice visit cousin Ernestine in San Francisco and discover that the famous cable cars are mysteriously breaking down.

While in East India, the mice visit Corbett National Park with Cousin Bajay and his friend Sarita, who is worried about the mysteriously disappearing animals.