A guest at an estate in northern Manhattan dives into the swimming pool and disappears. His murder brings up references to a mythological dragon which is said to prey on the imprudent, but Philo Vance uses his knowledge of both dragons and criminals to demonstrate whodunnit.
The estate in the novel was based on Tryon Hall, a mansion in Fort Tryon Park, built after 1900 by Cornelius Kingsley Garrison Billings, a retired president of the Chicago Coke and Gas Company. In 1917 he sold the mansion to John D. Rockefeller Jr.. The mansion burned down in 1925, and Rockefeller donated the land where it was located on to the city.
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