Peter Graves is a federal agent trying to find out the source of the amphetamines that is killing and driving insane so many long haul truck drivers. An opening segment shows one of the long haul truck drivers trying to stay awake and downing "bennies" as they call them here to the point where he sees cars where there are none, and swerves, crashing his truck and dying, grabbing the viewer's attention.
Tom Kaylor (Graves) goes undercover as a student truck driver. He moves into the rooming house run by the widow of the dead truck driver from the opening segment.
Tom keeps asking for bennies from people who he thinks might be selling them, and getting rebuffed - practically with a sermon - every time. His first partner on a long drive actually opens up to Tom about the bennie business and how the pills are killers and how he is going to ask around to see if he can find out who is supplying them. He winds up beaten to death.
There are a number of suspects as usual in this kind of film, and it keeps you guessing as to whether they are in on the pill business or just afraid of crossing those who are. The end is rather anti-climactic as the person who is the guilty party doesn't evoke either anger or sympathy from the audience. Plus the opening segment makes you believe that Kaylor is after a "Mr. Big", and this person hardly comes across like that.
The best part of this film is seeing Chuck Connors of "The Rifleman" TV fame, which is a role that is to come only a year later,as a perpetually hyped up hepcat amphetamine addict of a truck driver, "Mink", who also lives in the boarding house with Tom. It's worth the price of admission just to see him hammily - and figuratively - climbing the walls.
I'm giving this five points for Chuck Connors' cheesy performance and for the great roadhouse atmosphere of a bygone era - of boarding houses, transistor radios, cramped ma and pa diners with friendly service, of long haul working stiffs just trying to make ends meet. Then there is the sympathetic treatment the actual addicts are given. Considerable time is taken to show how some of the addicts got trapped in the web of addiction with a good dose of empathy.
