Sadie Hunt is not perfect, but her husband is. Nathan Hunt makes her coffee every morning, holds her hand until the last second, worships the Manhattan sidewalk on which she walks. But suddenly his behavior and attitude towards Sadie changed dramatically. Sadie finds herself in a position she never expected to be in: married, but alone. When the masculine and sexy Finn Cohen moves into the apartment next door, a spark instantly runs between him and Sadie. Finn represents the dream of a different life. Sadie wants to save her marriage. Their secrets should keep them at a distance without sparking a whirlwind romance. But while the relationship with her husband grows colder, the flame between her and Finn flares up. Her husband doesn't want her anymore. The man next door will give up everything to have her.