Daffy Duck stars as China Jones, an Irish private investigator operating in the vibrant city of Hong Kong, nestled in the Far East. His adventures begin at a bustling restaurant called Lo Down, where he discovers an unusual fortune cookie containing a desperate plea for help. The message reads: "HELP!! I'm being held prisoner in a Chinese bakery. - £150 REWARD," which, adjusted for today's currency, amounts to approximately £4,374. Intrigued and curious, Jones decides to pursue this mysterious tip, hoping to uncover a hidden crime or rescue a victim.
To find leads in a city filled with countless bakeries and potential clues, Jones seeks out hot tips. He encounters a solo musician advertising for such tips at a local bar run by Limey Louie, a former criminal who is currently doing time in prison. As Jones is about to leave the establishment, he is approached by Charlie Chung, a caricature reminiscent of Charlie Chan, who Jones treats as a fellow detective. When Chung mentions money matters, Jones mistakenly assumes he’s trying to cut into the reward.
The plot thickens when Limey Louie, having escaped from prison, hatches a plan for revenge against Jones. Louie, seeking vengeance for his imprisonment, baits Jones into falling into a trap. Disguised as a grieving “wife,” Louie initially roughs up Jones upon his arrival, claiming to recount the physical abuse he suffered at the hands of police. Louie then provides Jones with two false hot tips: the first pointing to No. 10, Wong Way, where Jones encounters a fire-breathing “Dragon Lady,” and the second leading to the second sampan at Ho Down Wharf. When Jones investigates this second location, the mooring rope is cut, causing the sampan to sink into the water instantly, dragging Jones with it into the depths.
Frustrated and eager for more leads, Jones presses Louie for genuine hot tips. In response, Louie drops his disguise and reveals his true intention: to exact revenge. As Jones tries to escape, he notices a "trap door" marked on the floor. Attempting to avoid the trap with a bamboo stick, Jones accidentally triggers the door, which opens into an alligator pit. Just as he is about to fall, Louie intervenes, playing a cruel game of “This Little Piggy” with his fingers and causing Jones to lose his footing, plunging into the danger.
Jones narrowly escapes from the alligator enclosure via a back exit and encounters Charlie Chung passing by again. Desperate, he begs Chung to arrest Louie. However, Chung reveals that he is not a detective but a laundryman, clarifying that the money he mentioned earlier was solely for paying a large laundry bill. Sarcastically, Jones remarks, "Confucius say, 'can't squeeze blood from a turnip!'", to which Chung responds with a threatening warning, saying, "Also say, 'B-better you press shirt than press luck!'"
The story concludes with an amusing twist. Jones is forced into performing laundry work to pay off his debts, and in a moment of comic desperation, he screams in rapidly spoken, subtitled “Chinese”: "Help! - I'm being held prisoner in a Chinese Laundry!" This catchphrase directly references the earlier fortune, tying the whole adventure together with its humorous and slapstick tone.
Throughout the film, Mel Blanc lends his voice to various characters, adding to the lively and comedic atmosphere of the story. The film is a playful parody filled with absurd antics, exaggerated caricatures, and humorous misunderstandings, characteristic of classic animated adventures.
