The Good Sister follows a couple who is working to put their crumbling marriage back together, when the wife receives a letter informing her that she has a long-lost twin sister. First thinking that the new family member will bring the couple closer together, the husband then begins an affair with the sister and discovers that she is treacherous and dangerous.
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Sonya Walger
Kate / Linda
Ben Bass
Jack McLennan
Bobbie Phillips
Mrs. Nelles
Ashleigh Harrington
Cassie
Alarey Alsip
Deb
Michael Hearn
Walberg
Noel Burton
Langler
Sam Stone
Cab Driver
Emma Dimig
Twin Girl #1
Sonia D'amico
Twin Girl #2
Howard Harris
Older Man
Simon Anthony
Police Officer
Yanik Ethier
Guy
Lyriq Bent
Investigator
Kathleen Glynn de Santiago
Mother (as Kathleen Glynn)
