The grief-stricken Mozarts are barely communicating with each other, while Salieri is promoted and assumes more power to pull the strings against Amadeus's success. Receiving another commission, Amadeus is inspired by a contentious banned book, leaving Vienna and Constanze to compose in secret. As war brews, Salieri plants a spy on the Mozarts and then organises a riot at Amadeus's opening night.

Constanze finally uncovers the truth about her husband's death and ensures that Mozart is always remembered, and that Salieri is never forgotten.