- Country: Canada
- Genres: Drama, Mystery, Thriller
- Release: 2014-05-10
- Director: Philippe Gagnon
- Writers: Pablo F. Fenjves
- Language: English
- Stars: Sonya Walger , Ben Bass , Bobbie Phillips , Ashleigh Harrington
- Runtime: 84 min
- Awards: 1 win & 6 nominations.
- AKA: La jumelle (Canada) , Her Evil Twin (United Kingdom) , Traição em Família (Brazil) , La buena hermana (Argentina) , Nieznana siostra (Poland) , Kate et Linda (France, French Republic) , Sora cea buna (Romania) , The Good Sister , La gemella perfetta (Italy) , La buena hermana (Spain)
- Plot: 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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