Warner Bros. filmed several of these Nancy Drew stories in the late 1930s with Bonita Granville, Frankie Thomas and John Litel top-billed and this one is probably the best--and the only one actually based on one of the early Carolyn Keene novels.
But the script is a hapless, far-fetched one and really stretches credibility and patience when viewed today. Only a certain nostalgia for these kind of B-films that played the lower half of a double bill can have any appeal for modern viewers.
The actors aren't to blame. Bonita Granville as Nancy does an excellent job, as does Frankie Thomas as her All-American boyfriend Ted, and John Litel as her lawyer father. All of it, however, is weakened by a poor script and a weak storyline. Only the last twenty minutes or so maintains any real suspense.
Most of it is pretty uninvolving but appeals more as a curiosity piece than anything else.