Deadly Duo

Saw this movie on TV recently; not much to get excited about. The actors seemed charming, especially supporting actor Robert Lowery, who has a resemblance to Clark Gable or Cesar Romero. It seems like the entire movie was shot inside a single Hollywood sound stage. Marcia Henderson, whom I have never heard of, played two characters who were twin sisters: one nice, the other mildly evil. The evil sister's part was overacted to say the least, but perhaps that was what the script called for. The movie took place entirely in Acapulco, Mexico, but it sure could have used a few more Acapulco scenes. i agree with an earlier commenter: what happened to Craig Hill? He had leading-man good looks, but he seems to have disappeared from view after Whirlybirds.