Struggling with marital problems, a man begins a passionate affair with his wife's long-lost, twin sister.

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.—Danielle NG See Quan

Jack and Kate are a couple working hard to put the pieces of their crumbling marriage back together. When Kate receives a letter informing her of a long lost twin sister named Linda, she is very hesitant. But Jack is hopeful this new family member will help bring the couple closer together. As he attempts to reunite the sisters, he reluctantly finds himself drawn to Linda - a vivacious, sexier version of his own wife. It's a pull he can't ignore and before long the two are embroiled in a passionate affair. But Jack will quickly discover the choice isn't between two sisters, it's between life and death as his affair with Linda proves to be much more treacherous than he could have ever imagined.—Anonymous