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.
as Kate / Linda
as Jack McLennan
as Mrs. Nelles
as Cassie
as Deb
as Walberg
as Langler
as Cab Driver
as Twin Girl #1
as Twin Girl #2
as Older Man
as Police Officer
as Guy
as Investigator
as Mother (as Kathleen Glynn)
as Bill
as Michael
as Valet
as Psychiatrist
as Barbara
