I would say that the climax to the plot does not come until after Mr. Fitweiler has called Mr. Martin into his office and questioned him about what he did the night before. Mr. Fitweiler appears quite satisfied with Mr. Martin's story that he spent a very quiet evening, as usual, and went to bed early.
Before Mr. Martin can leave the office, Ulgine Barrows bursts in and screams, "Is the little rat denying it?" She must have realized that the story she had previously told her boss may have sounded preposterous and that she has no proof to back up a word of it. After repeating what she had previously told Mr. Fitweiler, she asks him:
"Can't you see how he has tricked us, you old fool? Can't you see his little game?"
By calling Mr. Fitweiler an old fool, she has cut her own throat. She has not only been extremely disrespectful, but she has shown her true opinion of her employer. This is the climax. Mr. Martin has achieved his goal of making her look crazy and has won the victory in the conflict that is...