Elisabeth's body is brought to the pharmacy later that day, an apparent suicide by drowning, upsetting Thymian.
Robert Henning's assistant, Meinert, promises to explain it all to Thymian later that night but instead rapes her while she is unconscious, and she also becomes pregnant.
Though Thymian refuses to name the illegitimate baby's father, her relatives find out by reading her diary and decide that the best solution is for her to marry Meinert.
Her father is shocked when he realises what she has become, and Meta and Meinert prevent them from speaking by quickly ushering Robert out of the nightclub.
Osdorff, who had been counting on the money to rebuild a life for himself, throws himself out of the window to his death when Thymian tells him what she has done.
Count Osdorff follows the two women; but before leaving, he pauses, turns back toward his startled cousin and declares: "A little more love and no-one would be lost in this world!"
[1] Roger Ebert included Diary on his list of "Great Movies," calling it "the close of [Louise Brooks'] glory days.