As the Oland films progressed, so did the body count of victims who met their demise in the course of the story. In the first half dozen or so Charlie Chan films with Warner Oland, there was only one murder to be solved; in the next four films (Racetrack, Opera, Olympics, Broadway) there were two. More was not necessarily better, as "Monte Carlo" is not as highly regarded as many of the other Oland Chan's.
Harold Huber appeared in "Charlie Chan on Broadway" as an ineffective New York City police inspector; in "Monte Carlo", his character is an ineffective French police officer, although his accent passes reasonably well. His presence treads the line between serious noir drama and comedy relief.
The story itself involves the repeated theft and reappearance of a series of metallurgic bonds worth twenty five thousand dollars. At the center of the mystery are two wealthy but antagonistic businessmen, Victor Karnoff (Sidney Blackmer) and Paul Savarin (Edward Raquello), seen early in the film at a gaming table - "They play only to visit insult to each other." As commonly seen in Charlie Chan mysteries, there is a host of additional characters to keep track of before the final resolution is worked out by the Oriental Detective, with information not readily made available to the viewer.
To keep a light hearted touch in the film, there are a couple of running gags that include a backfiring taxi and Lee Chan's fractured attempt at the French language. When 'Pop' tries to order a breakfast plate of waffles using a hand drawn picture, the waiter brings him a crossword puzzle book. Earlier, Lee's description of a dead body found in an abandoned car resulted in a confession to the murder!
Lee's all around legend as a jack of all trades is added to here, as we learn that he has a painting to be shown at a Paris exhibition, adding to his reputation as college student, businessman, and gold medal swimmer. It would be another ten years before Keye Luke shows up again in a Charlie Chan film, co-starring with Roland Winters in the role of Charlie, along with Victor Sen Yung as Number #2 Son Tommy, the only time Luke and Sen Yung would appear together in a Chan film as brothers. Oddly, Luke never appeared in a Chan film with Sidney Toler, who replaced Warner Oland in the next twenty two Charlie Chan mysteries!