In the middle of the night, a black cat haunted the roof; in the room, a pair of gloved hands was flipping the jewels in the box; the next morning, there was a scream of lost jewels. The thief John Robbie, once nicknamed "Black Cat", is living a leisurely life with his beloved Black Cat in his beautiful country house, but the police come to the door because of successive jewelry thefts that resemble his modus operandi. John easily got rid of the police tracking and decided to investigate the case by himself.
John came to Mr. Bar's restaurant. Mr. Bar was also the head of the thief group before the war. He was born and died with John during the war. After the war, he opened a restaurant and took in a large number of prisoners who were released from prison. John couldn't find a clue, but was regarded as a trouble by these former prisoners, and the police followed him and had to leave. With the help of the restaurant waiter Fu's daughter, John came to Cannes Beach. Fu's daughter is a very enthusiastic girl who has been pursuing John passionately.
In Cannes, John started his own plan with the support of the manager of the insurance company. Based on a list of treasures, he approached Steven mother and daughter from the United States. Mrs. Steven is a straightforward woman. The beautiful Miss Steven has a quiet appearance and loves to stimulate life when she is alone. Miss Steven saw through John's identity from the beginning, but for more excitement, she kept playing love games with John.
Steven’s mother and daughter’s jewels were stolen by John’s side. Miss Steven mistakenly thought that John had cheated on them and was very angry, but Mrs. Steven helped John escape the police. John came to Xiao's villa and waited for the black cat to appear, and killed Fu who had attacked him in the fight. John gradually understood the truth of the matter.
Steven’s mother and daughter helped John get involved in a grand masquerade, and the insurance company manager pretended to be John to attract attention. The real John was hiding on the roof to monitor everything. Just when John was about to lose patience, the black cat appeared, it was Fu's daughter. During the struggle, John forced her to tell her behind the scenes, it was Mr. Ba, who had never changed her old habits, and the black cat was finally cleared of the crime. Miss Steven followed all the way to John Robbie, who had escaped in the chaos, and came to John's villa, and couldn't help but rush into his arms
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