I saw "Ring Of Fire" as a kid growing up in Seattle and it stuck with me, though I couldn't remember exactly why. I kept looking and finally found a copy. (hint) You don't have to look too far.
If you want the plot laid out you'll find many great synopsis above and below . My point here is to say that even though it's dated the picture is fast paced and exciting. The characters are all archetypes: "Good Cops" versus "Bad Girl" and "Delinquent Punks" very crudely drawn but you find yourself caring about what happens to them. The other actors look like they might have been pulled in off the streets of Vernonia but it gives the film a realistic feel. The super real color cinematography reminds me of the boxes of Kodak slides and photographs us boomer's have stuffed in closets and attics.
David Janssen stands out as the big hearted cop. His shy mumbling affect is a sharp contrast to his large frame and ruggedly handsome face. Frank Gorshin is creepy as the ringleader and Joyce Taylor is, well, Joyce Taylor. Probably one of the worst actors to ever "grace" the silver screen. Watch her in "Atlantis The Lost Continent" and see if you don't agree. The opening scene with Taylor in the café is as comical as a Carol Burnett skit. Though the acting in this picture could be better it's well worth your time. The ending is very tense and will hold your interest.