Charlie hires three “party girls” to help him land a business deal.

The owner of a department store is threatened with divorce by his wife, who has gotten reports that he's been seen in the arms of a beautiful blonde on the night of their 20th wedding anniversary. He has to find a way to convince her that the "beautiful blonde" in question was actually a store mannequin that he was taking in for repairs.

Chinese sleuth Charlie Chan discovers a scheme for the theft of government radar plans while investigating several murders.