Chan, in Paris for a reunion with friends from World War I, becomes involved in investigating the murder of a munitions manufacturer who was supplying arms to the enemy, even as the rising clouds of World War II force the city into nightly blackout status..
When the murdered body discovered by beautiful, vivacious socialite Melsa Manton disappears, police and press label her a prankster until she proves them wrong.
Circumstance, an old flame and a mother-in-law drive a happily married couple to the verge of divorce and insanity.
