
The negligent owner of a tenement slum becomes romantically involved with one of the building’s residents.
Does One Third of a Nation have end credit scenes?
No!
One Third of a Nation does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of One Third of a Nation, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Jeff Corey
Man in Crowd at Fire (uncredited)

Myron McCormick
Sam Moon

Sylvia Sidney
Mary Rogers

Percy Waram
Arthur Mather

Iris Adrian
Myrtle

Leif Erickson
Peter Cortlant

Robert George
Building Inspector

George Lessey
Doctor (uncredited)

William Challee
Reporter (uncredited)

Hugh Cameron
Mr. Cassidy

Charles Dingle
Mr. Rogers

Otto Hulett
Assistant District Attorney

Miriam Goldina
Mrs. Cohen (1870)

Baruch Lumet
Mr. Rosen

Hiram Sherman
Donald Hinchley

Byron Russell
Inspector Castle

Muriel Hutchison
Ethel Cortlant

Horace Sinclair
John (Butler)

Edmonia Nolley
Mrs. Rogers

Julia Fassett
Mrs. Cassidy

Max Hirsch
Mr. Cohen (1870)

Wayne Nunn
Inspector Waller

Bea Hendricks
Min

William Pote
Jim
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Read the complete plot summary of One Third of a Nation, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
On a night when a fire roars through a run-down New York City tenement, a young boy named Joey Rogers scrambles toward a faulty fire escape that collapses, leaving him badly injured. His much older sister, Mary Rogers, rushes him to the hospital with the help of the wealthy Peter Cortlant, who covers the medical bills on the spot. Cortlant is informed by his trusted ally and business mind, Arthur Mather, that he actually owns the building where the fire occurred.
The local district attorney digs into the incident and explains that the tenement’s age makes it exempt from modern building safety codes. Since no tenants had previously lodged complaints, no crime is straightforwardly established. When Cortlant visits the burned site, he is warned to steer clear of Mary Rogers by her boyfriend, Sam Moon, a tension that foreshadows the social and personal ramifications of the case.
Mary learns of Cortlant’s ownership of the building and, frustrated by the situation, takes Joey out of the hospital. The boy, crippled and increasingly delusional, believes the building itself is speaking to him and he vows revenge on the tenement. In the meantime, Mary meets again with Peter Cortlant and persuades him to consider converting his decrepit properties into public housing and to rebuild them for the city’s benefit.
Cortlant’s cost concerns, however, weigh heavily. His sister, Ethel Cortlant, grows worried about the project and resorts to blackmail—threatening to reveal an alleged affair with Mary to the press in an effort to derail the plan. The moral and financial stakes climb as the plot moves toward a brutal turn of events.
Tragically, Joey dies after setting fire to the tenement, a blow that ripples through everyone involved. In the wake of his death, Sam Moon tells Cortlant that he will marry Mary to shield her from scandal, a revelation that clears a path for Cortlant to push forward with his redevelopment plan. The result is a complex tapestry of ambition, tragedy, and social reform that frames the uneasy balance between humanitarian aims and personal interests.

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