Chinatown After Dark is where you'll find Madame Ying Su (Carmel Myers), a "dragon lady" type who'll stop at nothing to get her hands on a rare dagger belonging to the Royal House of Lee Fong. Unbeknownst to the authorities, the dagger contains a priceless jewel, the owner of which will be able to wield untold power over all of Chinatown. American Jim Bonner (Rex Lease), in love with Lee Fong's ward Lotus (Vera Reynolds), is set up as the fall guy when the dagger is stolen and a man is murdered. Bonner spends the rest of the picture trying to prove his innocence to a sneezing comic-relief detective (Billy Gilbert, in one of his first important feature-length roles. "See what happens in the underworld dens after dark!" entreated the ads for this fast-moving cheapie.