When a group of young filmmakers witness and film a crime of passion, the most outrageous blackmail of the century begins. By means of a fantastic plan, the filmmakers send to the murderer, a financial and industrial big shot, a copy of the movie that incriminates him and they demand him an improvement of the standard of living for the working class.
After a successful robbery leaves famed thief Lupin III and his partner Jigen with nothing but a large amount of fake money, the so called "Goat Bills", he decides to track down the counterfeiter responsible - and steal any other treasures he may find in the Castle of Cagliostro, including the 'damsel in distress' he finds imprisoned there.
Egon plans to exploit knowledge gained during his latest term of incarceration. By stealing the unmanipulated financial records of DanInvest he obtains the majority of the stocks in the department store Magasin du Nord, just in time for their closing sale.