During a rebellion of prisoners at the San Quentin State Prison, Boston Blackie makes a lightning escape aided by Mary McGinn while chased prison guards. Mary is a school girl, unaware that her brothers are crooks. She is expelled from school. Blackie rejoins his gang and takes refuge in Mother McGinn's house, where he again meets Mary. She devotes herself to making Blackie go straight and wins her point.
Director:
Writer:
Colleen Moore
Mary McGinn
Forrest Stanley
Boston Blackie
Margaret Seddon
Mother McGinn
Hobart Bosworth
Warden
George Cooper
Travel
Eddie Phillips
The 'Glad Rag' Kid
Wade Boteler
Detective O'Leary
Tom Bates
Sandy
Carmelita Geraghty
Ethel Grayson
Maxine Elliott Hicks
