In Act Four Lulu is now married to Dr Schön but is unfaithful to him with several other men (Schigolch, Alwa, the circus artist Rodrigo Quast and the lesbian Countess Geschwitz). On discovering this, Schön presses a revolver into her hand, urging her to kill herself. Instead, she uses it to shoot Schön, all the while declaring him the only man she has ever loved. She is imprisoned for her crime.
Her escape from prison with the aid of Countess Geschwitz and subsequent career down to her death at the hands of Jack the Ripper in London are the subject of the sequel, Pandora’s Box. It is now customary in theatre performances to run the two plays together, in abridged form, under the title Lulu.