Even after watching it a couple of times, this - admittedly unique - entry in the 'Charlie Chan' series still looks like a somewhat strange and a little bit inappropriate mixture of a 'usual' murder mystery and an early WWII flag waver. It starts like a Newsreel about the dramatical political developments in Europe; and it is announced that on September 28, the whole city of Paris has to remain in darkness because of the possibility of a German air strike.
The next thing we see is a reunion party of secret agents from WWI, to which M. Romaine, the Prefect of Police, has invited his old friend Charlie Chan; and they drink a toast to peace, hoping there'll not be another war soon...
But at the same time, there is a spy ring of an enemy country in full activity: Charlotte Ronnell arranges with sinister Belescu that a cargo full of French weapons manufactured by another enemy spy, Petroff, will sail out the same night to get into the enemy's hands before an embargo will be imposed; but Belescu tricks them, and they're left without the necessary papers. And in another part of Paris, Petroff's innocent former secretary Tony Madero wants to flee the country in order not to be accused as a member of the spy ring, and his wife Marie promises him to get him a ticket and a false passport from shady M. Santelle - but she's got to raise a lot of money, and her only hope is Petroff...
... And a few hours later, Petroff is found shot, discovered by his butler Antoine, a veteran from WWI who has just sent his young son to the army; and so, while the soldiers are leaving for a possible war, Charlie and his friend's godson, dopey inspector Marcel (played once more by Harold Huber, who specialized in playing nervous, clumsy Frenchmen) investigate the Petroff murder, looking for clues like a camellia lying next to the body, a smashed window in the cellar, and so on...
Somehow, this mixture doesn't work properly - solving a murder case (even if it's connected to a dangerous spy ring) amid the atmosphere of a city preparing for war is simply somehow like losing one's sense of proportion... And when the case is solved, the film takes us back to politics: Romaine proclaims happily that there will be NO war, because Hitler has just invited the French and British Premiers to a conference in Munich! BUT since the film was released in December 1939, the further developments were already known by that time; and so Charlie Chan can utter one of his wise 'foretellings': 'Beware of spider who invites fly into parlor'...
