Fourth and last film in the "Nancy Drew" series released by Warner Bros. from 1938 to 1939. Three years later, the series' star, Bonita Granville, would return to Warners briefly for a supporting role in the Bette Davis classic, Now, Voyager (1942).
To promote this film, Warner Bros. created a Nancy Drew fan club for teenage girls.
Mr. Drew's car is a 1939 Buick Roadmaster convertible sedan.
This film took its title from one of the most popular entries among the dozens of Nancy Drew books. The novel was originally published in 1930, and its plot bore little resemblance to the storyline of this film.
This film's earliest documented telecasts took place in Salt Lake City Saturday 13 October 1956 on KUTV (Channel 13) and in Indianapolis Wednesday 24 October 1956 on WISH (Channel 8); it first aired in Albuquerque Sunday 25 November 1956 on KOAT (Channel 7), again in Albuquerque Saturday 22 December 1956 on KGGM (Channel 13), and in Sacramento CA Sunday 6 January 1957 on KBET (Channel 10).