An elderly motel owner is assaulted in a robbery attempt. She identifies one of the guests, Roger Taylor, as the man who assaulted her - clearly her identification is based on the hat and coal the culprit wore which were proved to be Taylor's. Taylor insists he's innocent and agrees to take a lie detector test, which he passes as does the motel owner. Mathews totes the detector around and administers the tests himself. It's pretty obvious who the real bad guy is and fortunately he's dumb enough to try to rob the owner again and place the blame on Taylor via a confederate. Fortunately, Mathews isn't dumb and nabs the culprits. The whole business with the lie detector was interesting but kind of sketchy. Call Northside 777 was better in explaining how detectors worked. The fellow who played Taylor (Jonathan Hole) also was in a Perry Mason episode and has perfect servile clerk mannerisms and look.
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