Richard Widmark stars as a doctor with the Public Health Service in New Orleans. He is called in when a murdered man turns out to have had a version of the plague. He works with the police to find everyone who had contact with the dead man.
As Widmark and the police are searching the city, the people who killed the dead man are convinced the dead man brought something valuable to the city. So they’re trying to find that thing, which doesn’t exist.
Jack Palance has a role as a villain. He is good. Widmark is good in a heroic role. Paul Douglas has a role as a cop, and he was good too. It is a good movie. It is not a top ten noir.