Fatally injured by a harpoon and drowned in a pond.
Like Kit Snicket (and most likely Jacques Snicket), Dewey was four years old when The Schism began. On the night his parents were hanging balloons for the triplet's fifth birthday, Dewey and his brothers were taken by V.F.D. The woman driving the car took the Denouement brothers to the mountain headquarters to begin their V.F.D. training.
Dewey reveals that the same night he and his brothers were recruited, their parents perished in a fire that destroyed the family home. It is strongly implied that Olaf was responsible for this event.
Dewey was in a relationship and was possibly married to Kit Snicket, and is implied to be the father of Beatrice Snicket. In his library, located under Hotel Denouement's pond, he was building a catalog of evidence to be used against every villain. He also hid the Sugar Bowl there, so that Count Olaf could not find it. His catalog was, as he called it, his life's work and he died among all his hard work as he drowned.
The Penultimate Peril
When Count Olaf confronted him, Dewey did not reveal the location of the sugar bowl. He gave three hints to the lock combinations to the laundry room as proof that the sugar bowl was not there.
Unfortunately, after authorities arrived, Count Olaf thrust his harpoon gun into the Baudelaires arms, who dropped it and accidentally set it off, sending the harpoon through Dewey's stomach. Dewey reassured the Baudelaires that it was not their fault and whispered "Kit" before falling into the pond concealing the real Hotel.
- Main Article: References and allusions in Lemony Snicket's works
- Frank, Ernest, and Dewey's surname, Denouement, is a reference to the literary term dénouement, which refers to action that takes place between the falling action and the resolution of a plot.
- Dewey's name is a reference to the Dewey Decimal System, which is how the entire hotel is organized.
- Dewey said that his favorite section in the Dewey Decimal System was "020," which is About The Dewey Decimal system and Science.