At her murder trial, Lulu is sentenced to five years for manslaughter. However, Schigolch and Quast trigger a fire alarm and spirit her away in the confusion. When Alwa finds her back in the Schön home, he confesses his feelings for her and they decide to flee the country. Countess Augusta Geschwitz, herself infatuated with Lulu, lets the fugitive use her passport. On the train, Lulu is recognized by another passenger, Marquis Casti-Piani. He offers to keep silent in return for money. He also suggests a hiding place, a ship used as an illegal gambling den.