From George Montgomery to Rock Hudson, actress Marcia Henderson usually played the good girl to a good man... and she's a good girl here too... widowed to a rich man without caring about anything but her son... and the titular DEADLY DUO twist is, she has an identical twin sister, also played by Henderson...
The first is brunette and sweet as pie, the other's bad and blonde and, married to a lowlife yet charming former nightclub owner, they're all being checked out by lawyer Craig Hill who, sent for the rich grandmother's custody of the son, is actually the lead character despite Marcia's double role...
Her best moment is playing the blonde sister acting like while disguised as the good sister, providing an evil glint within a docile grin, while Hill... not a great actor but passable here... doesn't catch on...
And why should he since Marcia Henderson is great in the double role, playing both sisters like completely separate humans... as is her job as a actress, ending a b-movie career with a literal double-whammy in a low-budget neo noir that, lacking action and full of dialogue, remains an intriguing, visual page-turner.
The first is brunette and sweet as pie, the other's bad and blonde and, married to a lowlife yet charming former nightclub owner, they're all being checked out by lawyer Craig Hill who, sent for the rich grandmother's custody of the son, is actually the lead character despite Marcia's double role...
Her best moment is playing the blonde sister acting like while disguised as the good sister, providing an evil glint within a docile grin, while Hill... not a great actor but passable here... doesn't catch on...
And why should he since Marcia Henderson is great in the double role, playing both sisters like completely separate humans... as is her job as a actress, ending a b-movie career with a literal double-whammy in a low-budget neo noir that, lacking action and full of dialogue, remains an intriguing, visual page-turner.