Police detective Mary Ryan is given an assignment to break up a gang of jewel thieves and fences. She, using an alias as a convict, is placed in the cell with a suspected member of the gang.... Read allPolice detective Mary Ryan is given an assignment to break up a gang of jewel thieves and fences. She, using an alias as a convict, is placed in the cell with a suspected member of the gang. Upon release she becomes a gang member but the gang leader is suspicious of her.Police detective Mary Ryan is given an assignment to break up a gang of jewel thieves and fences. She, using an alias as a convict, is placed in the cell with a suspected member of the gang. Upon release she becomes a gang member but the gang leader is suspicious of her.