Given the question: Build a movie plot around this: What do the detectives suspect of Sal and Angie? They are involved in some kind of criminal operation
The answer is:
In Marseille, an undercover detective is following Alain Charnier (Fernando Rey), a wealthy French criminal who runs the largest heroin-smuggling syndicate in the world. The policeman is assassinated by Charnier's hitman, Pierre Nicoli (Marcel Bozzuffi). Charnier plans to smuggle $32 million worth of heroin into the United States by hiding it in the car of his unsuspecting friend, French television personality Henri Devereaux (Frederic de Pasquale).In New York City, detectives Jimmy "Popeye" Doyle (Gene Hackman) and Buddy "Cloudy" Russo (Roy Scheider) are conducting an undercover stakeout in Bedford-Stuyvesant, Brooklyn. After seeing a drug transaction take place in a bar, Cloudy goes in to make an arrest, but the suspect makes a break for it, cutting Cloudy on the arm with a knife. After catching up with their suspect and severely beating him, the detectives interrogate the man, who reveals his drug connection.Later, Popeye and Cloudy go out for drinks at the Copacabana, where Popeye notices Salvatore "Sal" Boca (Tony Lo Bianco) and his young wife Angie (Arlene Farber) entertaining mob members involved in narcotics. They decide to tail the couple, and soon learn that the Bocas, who run a modest newsstand luncheonette, have criminal records: Sal for armed robbery and murder, and Angie for shoplifting. The detectives suspect that the Bocas, who frequent several nightclubs and drive expensive cars, are involved in some kind of criminal operation. They soon establish a link between the Bocas and lawyer Joel Weinstock (Harold Gary), who is part of the narcotics underworld.Soon after, Popeye learns from an informant that a major shipment of heroin will arrive in the New York area. The detectives convince their supervisor, Walt Simonson (Eddie Egan), to wiretap the Bocas' phones, and they use several ruses to obtain additional information. Popeye and Cloudy are joined in the investigation by a federal agent named Mulderig (Bill Hickman). Popeye and Mulderig dislike each other based on having worked together in...