
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.

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

The Man with the Golden Arm
The Man with the Golden Arm

Sashka The Seminarian
Sashka The Seminarian

The Best Years of Our Lives
The Best Years of Our Lives

The Possession of Hannah Grace
The Possession of Hannah Grace

Fifth Avenue Models
Fifth Avenue Models

Empty Hearts
Empty Hearts

Divorce and the Daughter
Divorce and the Daughter

The Case of Lena Smith
The Case of Lena Smith

Jim the Penman
Jim the Penman

Sealed Hearts
Sealed Hearts

Adoration
Adoration

For Another Woman
For Another Woman