Frank Albertson was never better. He plays an insurance investigator & with Robert Armstrong as arson detective solve the string of arson for profit crimes. This movie is so rare I am the only person to have seen it! OK the arson gang uses a telephone vibrations to set the fires. They remove valuable stuff and replace it with with junk. Then the valuable stuff is resold so they collect two ways. A wick is set into the phone box so that when called the ringing sets it off. Lew Landers used real fire footage mixed in with skillfully shot low budget effects. A beautifully written drama by which Frank Albertson wisecracks his way thru as only he can. a success in every way.