Very typical Chinese historical drama with quality acting, sets, costuming, props & action scenes. The writer takes literary liberties with known documented occurrences of occupying Japanese testing cholera on Chinese civilians in the years leading up to WWII.
A, at times, slapstick comedic rendition of some Chinese intelligence agents acting as Japanese Kabuki and other unusual roles in order to elicit an antidote from a captured Japanese officer and his scientist. And, at other times, a to-the-death standoff confrontation with the occupying military who have them surrounded.
What lowers it's rating? First, the script tended to jump about, especially time periods which to a non-Mandarin speaking person made it difficult to follow. Second, the English subtitles moved far too quickly to both view the movie and finish reading the text. If we add time for comprehension then the storyline came across as more confusing than it needed to be. Not a comfortable flow to how the story was presented.