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A follow-up to the wildly popular All the Wrong Clues, this slapstick comedy directed by Teddy Robin Kwan, who had a supporting role in the original, concerns a number of shady characters looking to get their hands on atomic bomb secrets in Japan-occupied Hong Kong during World War II. Private detective-cum-resistance fighter Yoyo (George Lam) receives orders to get the formula from a Jewish scientist who is defecting from the Nazis. When corrupt police commissioner Fat Chick (Paul Chun) swipes the plans from the scientist, Yoyo and his childhood chum Police Inspector Robin (Kwan) set out to steal it for themselves. Unfortunately, a beautiful cat burglar, who is also Yoyo's ex-girlfriend Bridget (Brigitte Lin), beats them to it. Yoyo and Robin then set their sights on Japanese diplomat Tora Hiroshima (played by Tsui Hark, who directed the first installment), who is supposed to receive the plans from Fat Chick.