With the exception of the Rathbone and Bruce Sherlock Holmes series, this is quite possibly the best of the 'mystery' series of the 30s and 40s. The series begins with this movie as Phil Morgan, master criminal, is double crossed by his gang, beaten and dumped along a roadside. As a result, he suffers from amnesia. This movie, the first of the series, establishes The Crime Doctor's background, explains how and why he became a doctor (a psychiatrist, actually), head of the parole board and helped many convicts find the 'straight and narrow'.
The element that makes this movie and the series in general unique is that it relies on psychiatry and the tendencies of the mentally ill. They often tease you by inserting an obviously unbalanced person and although the plot may lead one to believe that person is the "perp" they may or may not be the actual "perp". Because psychiatry was relatively new and often misunderstood, it provided general insight to the subject. In many ways, the series has yet to become dated although the psychological concepts may appear to be fairly basic nowadays.
A series of factors make this movie series much more enjoyable than others such as The Lone Wolf, Boston Blackie or Bulldog Drummond. The first is the consistency. The quality of the stories in all ten movies remains high throughout the series where the stories of other series tend to deteriorate into standard potboilers after the studio has captured the audience's interest. Second, the same actor plays the lead character in all of the movies. Third, the quality of the supporting cast is exceptional throughout the series. Some of the more recognizable supporting cast includes John Litel, Ray Collins, Harold Huber, Barton MacLane, Jerome Cowan, Reginald Denny, Eduardo Ciannelli, Nina Foch, George Zucco, Ben Weldon, Hillary Brooke, William Frawley, Ellen Drew and last, but far from least, a very young Lois Maxwell who played Miss Moneypenny in at least 15 James Bond films.
However, over the six years the series was shot, one can easily see Baxter's health deteriorating.