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The excellent 1971 film of The French Connection, starring Gene Hackman and Roy Scheider, has been running quite frequently on the Fox Movie Channel of late. Maybe it’s the fact that it’s usually on late at night, so my focus is fuzzy, but there’s a major plot point in it that always had me confused.

The brown Lincoln Continental is brought into the country, loaded with concealed heroin, by the French connection. Then Sal Boca, the American connection, takes the car from a hotel parking ramp and parks it overnight on a seedy waterfront street, where it is nearly stripped by a roving chop shop gang. Popeye has the car impounded, the cops (finally, after hours of searching) discover the drug cache, then they close it back up good as new and return it to—the French connection, who later takes it to a desolate island in the East River for the deal to go down with Sal.

So here lies the confusion: why does Sal take possession of the car, full of drugs, before the deal—and then abandon it in a bad area? Why doesn’t he just off-load the drugs right then?

The answer lies in Robin Moore’s terrific non-fiction tale of, as he hyperbolically puts it, “the most crucial single victory to date in the ceaseless, frustrating war against the import of vicious narcotics into our country.” As Moore explains, the car (in reality a tan 1960 Buick Invicta) was left by the American connection on that waterfront street because at that point it was loaded, not with drugs, but with the cash payoff from a previous import. The car soon disappeared from the street, picked up by an unseen accomplice, and returned to Montréal (and ultimately France) to begin the next, even bigger, drug smuggling operation.

The stake-out scene in the movie is tense and dramatic, and it makes sense that it was included virtually unchanged from the book. But because the filmmakers have conflated two separate deals into one big deal, the chain of events ceases to make any sense at all. I find this ironic, considering that The French Connection is one of the films that is lauded for its gritty realism, a hallmark of American cinema in the 1970s. It’s a great movie—if for nothing else than the classic, nay, iconic chase scene between Popeye in a borrowed Pontiac Le Mans and his intended assassin in a commandeered elevated train—yet its five Academy Awards completely overshadow its excellent, worthy source material: Robin Moore’s 1969 book.