The beautiful and intelligent Keetje fiercely resists, but in the end she, like her sister, continues to decline morally. She ends up in a brothel and becomes a prostitute. By coincidence she meets the cheerful painter George, the bon vivant Hugo and rich notary's son André.
This introduction changes her life completely. Hugo takes Keetje as a mistress. She loves him and wants nothing more than to get married romantically, but Hugo holds back the boat. In turn, André worships Keetje, who is quickly adapted to 'the better circles'. She begins to share his socialist ideas and thus also betrays her origins. When Hugo drops her to marry a rich girl, Keetje finally marries André and the former hooker becomes a fairytale rich woman.