Sibling rivalry is a . Sam and Stella are closer than most brothers and sisters. Born only minutes apart, they're both best friends and lifelong adversaries. Sam's not worried about who's living the better life. So what if his law degree isn't getting much use, his last relationship was a failure, and he spends most weekends hungover. Despite Stella's nagging mockery, Sam is happy. But Stella is happier (and she'll be the first one to tell you). She has a skyrocketing career and imminent engagement to look forward to. And if she's too busy climbing the corporate ladder to focus on friendships, what does it matter? All she needs is her twin brother. There's never been a threat to the sibling hierarchy... until Harper. Sam's unexpected one-night stand has the potential to be more. So why isn't Stella happy for her brother? A rivalry like theirs has its challenges- after all, portraying the perfect life isn't easy. And in their final act, Sam and Stella's darkest secrets and true selves will be revealed. No one knows you like your twin, right?