- Country: USA
- Genres: Action, Crime, Drama
- Release: 1950-01-05
- Director: Abby Berlin
- Writers: Harry Fried , George Bricker
- Language: English
- Stars: Marsha Hunt , John Litel (1892–1972) , June Vincent , Harry Shannon , William ‘Bill’ Phillips , Katherine Warren (I) (1905–1965) , Victoria Horne , Gertrude Astor (1887–1977) , Stanley Blystone , Paul Bradley
- Runtime: 68 min
- Awards: N/A
- AKA: Mary Ryan, Detective , Mary Ryan, Detective (Canada) , Mary Ryan, detectivă (Romania) , Mary Ryan, Detective (Australia) , Mary Ryan, Detective (New Zealand) , Dama y policía (Mexico) , Mary Ryan, Detective (United States of America) , Mary Ryan, Detective (United Kingdom)
- Plot: 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.
- IMDB:tt0042715
Mary Ryan, Detective Cast · · · ALL
Abby Berlin
Director
Marsha Hunt
Mary Ryan
John Litel
(1892–1972)
Capt. Billings
June Vincent
Estelle Byron
Harry Shannon
Sawyer
William ‘Bill’ Phillips
Joey Gurney (as William Phillips)
Katherine Warren
(I)
(1905–1965)
Mrs. Angie Sawyer
Victoria Horne
Wilma Hall
John Dehner
Belden
Arthur Space
Mike Faber
Kernan Cripps
Riley
Chester Clute
Chester Wiggin
Paul E. Burns
Collins
I. Stanford Jolley
Mike, the Chauffeur
Bess Flowers
Mrs. Moss (aka Mrs. Horne)
Isabel Randolph
Isabel Simpson
Ben Welden
Sammy
Robert Emmett Keane
Munsell
Doreen McCann
Patsy Hall