That's what the Crime Doctor must determine when the son-in-law of a knife thrower is sentenced for killing his father who disapproved of his marriage. This film also involves a painter of copies of classic paintings and culminates with an auction where Warner Baxter (in one of his last of this series) hopes to trap the guilty party who has already added several other corpses to the pile.
As with other films in the series, this has many convoluted clues to prevent the audience from figuring out who the killer is. There are however, some interesting tidbits concerning the Parisan art world, including some ironic ways of figuring out if a painting is an original or a copy. Late in the series, it is definitely showing its age, especially when compared to the other detective stories of the time (now more film noir) rather than "series" films which were slowly disappearing from the bottom half of double bills.
As with other films in the series, this has many convoluted clues to prevent the audience from figuring out who the killer is. There are however, some interesting tidbits concerning the Parisan art world, including some ironic ways of figuring out if a painting is an original or a copy. Late in the series, it is definitely showing its age, especially when compared to the other detective stories of the time (now more film noir) rather than "series" films which were slowly disappearing from the bottom half of double bills.