Gonna Get You (1976)

The Wynners band is preparing to be invited to sing in US. The leader of the underworld wants to take advantage of his unpreparedness and exchange the guitar containing drugs with them for shipment to US. Later, due to a fire at the nightclub where Wynners went to US to perform, there was only a turn back. Seeing that the plan failed, the underground boss ordered his subordinates to exchange their guitars. The three tried their best, but they couldn't get the guitar back. After Wynners noticed a problem with the guitar, one pried the guitar off the back of the car and discovered there was drug powder hidden inside. He called the police. Later, the police asked Wynners to assist in solving the case, but there was no result. Wynners was rehearsing in the Great Hall. During the rehearsal, four went out to eat, while Chen stayed in the dressing room alone to sleep. A gangster sneaked in and stole the guitar. Chen woke up and secretly followed, and the four also followed after him. The five tracked down to underground boss's castle, but were found and fled in a hurry. Fearing that the secret might leak out, the boss led his followers to pursue the five to the Great Hall, and was eventually rounded up and caught by plainclothes detectives on the spot.