It was not until close upon six o’clock that I found myself free and was able to spring into a hansom and drive to Baker Street, half afraid that I might be too late to assist at the dénouement of the little mystery.
There are no more uses of "denouement" in the book.
Show samples from other sources
Everyone was astonished by the denouement of the case.
While suspicion was to be directed against him, she would be making quiet preparations for a very different denouement.
Christie, Agatha -- The Mysterious Affair at Styles