After their boat trip on the Danube, the Mozarts land in Vienna, along with Devilius' deceitful trio. To prevent the Mozarts from entering Vienna, they steal Amadeus' father Leopold's wallet. This leads to big complications; customs officers mistake the Mozarts for merchants and ask them to pay high tariffs. Amadeus gets the whole harbor – including Empress Maria Theresia and her children – dancing with a sensational musical performance that convinces the customs officers. Now, nothing stands in the way of a visit to the imperial castle.