The basic plot for The Catman of Paris wouldn't win any awards for originality: it sees controversial author Charles Regnier (Carl Esmond) arriving back in Paris just as people start to turn up dead, scratched to ribbons, as though by a large cat. Suffering from memory loss at the same time as the murders, Charles begins to believe that he is responsible, and the police would just love to pin the blame on him, his latest book having upset the French government. All the evidence does seem to indicate that Charles is the killer, but beautiful Marie Audet (Lenore Aubert) believes otherwise.
It's not very hard to work out who is the real villain, but the supernatural revelation at the end isn't so easy to predict: a crackpot's theory that the killer is capable of transmutation, turning into a half-human/half cat, turns out to be on the money, leading to an entertaining finale featuring the furry, fanged feline/man. Also adding to the fun is a rousing fist fight between Charles and four men in a restaurant, and a high-speed horse and carriage chase scene in which the police are incredibly trigger happy, shooting wildly at the three passengers in the carriage in front.
