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Dr. Bruce Smith (Basil Gill) refuses to violate his Hippocratic oath of secrecy by testifying in a divorce case. This earns him widespread public approval but ends up boomeranging on him when he learns that his son Roger's (Maurice Evans) fiancee Joan (Norah Murray) is pregnant with another man's baby. Since the girl revealed this information in the confidence of Dr. Smith's office, he is honor-bound not to tell anyone -- even if it may damage his son's future happiness. Ultimately, the girl solves the doctor's problem by revealing the truth herself. Should A Doctor Tell? is a curious cinematic contribution from Edgar Wallace, an author most closely associated with pulpish melodramas and mysteries.