It's not a classic by any means. But it has its virtues - the black and white cinematography, the great jazzy soundtrack by Jerry Goldsmith, and particularly the extensive on-location shooting in and around Los Angeles. There are lots of scenes of 1950s cars cruising the street, store fronts and interiors - more than average, because they're looking for the protagonist. Living in LA, I especially enjoyed that. As for the plot, I've seen three or four similar plotted stories the last year - someone is contagious and threatens the city, or is carrying something radioactive, etc. This one had a slightly less plausible plot line, since the police weren't particularly protective. But I soaked up the ancillary elements - the acting was passable, the camera-work and lighting were above average - and I'm a sucker for the '50s.