What Books Feature Sister Rivalry Turned Deadly Plots?

Scarlet’s world shattered the night she discovered her husband in her bed with her own sister. The betrayal was brutal. The humiliation, unforgivable. And what hurt the most? Neither of them felt a single ounce of remorse. Within months, her husband divorced her and married the very woman who helped destroy her life, her sister. They thought she would break. They thought she would disappear quietly. They were wrong. Ryan Marchetti—cold, calculating, and dangerously powerful, has spent years waiting for the perfect chance to destroy his business rival. Marrying that rival’s ex-wife is the ultimate move. Strategic. For Scarlet, marrying Ryan isn’t about love. It’s about revenge. A calculated alliance. A public statement. A promise that she will rise from the ashes they left her in. Together, they become the scandal that shakes empires. But revenge is never simple. Because behind Ryan’s icy control lies a secret, one tied to her past, to her ex-husband, to the very marriage that ruined her life. A truth so explosive it could unravel everything she thought she knew. Was she just a pawn in Ryan’s war from the very beginning? Or is the man she’s slowly falling for capable of betraying her too? In a game fueled by vengeance, power, and buried truths, Scarlet must decide: Will she let betrayal destroy her again… Or will she risk her heart for the one man who might truly love her?

“She has twelve weeks to live. And she's running out of time to get revenge for her sister.” Alexa Lean grew up with only one person in her corner…her fraternal twin, Alice. Orphans. Outcasts. Each other's entire world. So when Alice is found dead in a campus lake, ruled as murder, Alexa doesn't mourn. She moved to Westbrook University. She enrolls as a transfer student. And she begins hunting the killer. But someone is watching. A break-in. A photograph of Alice's dead body. A whispered warning in the dark: "Stop asking questions." The deeper Alexa digs, the more she uncovers. A web of lies that has been strangling Alice since childhood. Then there's Myles Clay. Alice's boyfriend. Grieving. Gentle. Dangerous in ways neither of them expected. He should be a suspect. Instead, he becomes something worse: the only person Alexa can trust. As her body begins to fail and the killer closes in, Alexa must solve her sister's murder before the her illness solves her. But the truth is closer than she thinks. The killer has been watching her all along. And they're not done killing. Will Alexa’s sickness make her weaker or stronger in her journey to get revenge? Or will it be the only thing to build her?

Louella and Davina Mitchell are identical twins, but that's where it ends. Where Davina is filled with desire to help and respect others, Louella is filled with hate and debauchery in all aspects of life. The only thing they agree on is their hate for each other. When Louella tries to rob Davina of her inheritance, things start to backfire and her world comes tumbling down around her. Filled with supernatural creatures, magic, and time travel, this steamy, sexy paranormal romance/thriller will capture your attention from cover to cover.

Lily’s engagement turns to a disaster when her fiancé suddenly falls for her sister, Ivy and chooses her instead. The Jones sisters have always had their misunderstandings, Ivy being the youngest was everyone’s favourite meanwhile Lily was left to scraped off the little love her parents had left for her. She never complained, she was willing to let Ivy have all the love but not when it came to her fiancé, Jonathan Morel. He fell for her sister instead but what broke Lily completely was when her sister accepted his proposal without hesitation Fuelled by anger and Jealousy, Lily burns her sister alive, then reclaim her fiancé and at that moment, she believed everything was perfect. But one year later, the dead returns, the sister she set on firer returns as the wife of the eldest son of the Morel family, her new sister in law. Will this little reunion be messier than what everyone imagined, will they finally reconcile or is this just the beginning of a devastating war?

Like me, it seemed my younger sister was reborn. In our past life, she was obsessed with the golden boy of the elite circle. She would ditch classes, get into fights, and race through the streets at night all for him. In the end, she died for him in a storm and blamed me for all of it. After her rebirth, she manipulated our parents into transferring me to his class, notorious for being the worst in school. "Sis, this time, it’s your turn to get bullied by him. To fall for him. To suffer like I did." I just smiled. Coming back to life didn’t make her any smarter. Even if she lived a hundred lifetimes, she would never be a match for me.

She thought his heart belonged to her, but he chose her sister. Adriana Nox found her sister moaning beneath the man she was supposed to announce her relationship with. The strong Adriana Nox broke at that moment and never healed. She watched the man she had ever loved exchange vows with her sister, a disaster she never imagined would happen. Not only was she betrayed by the ones she loved, but declared a villain and cast away by the same people she trusted. But Adriana swore never to go down into the pit of fire alone. She would drag everyone down with her, including her beloved sister and the love of her life. Note: This is Book 2 of The Nox Bloodline Series. It can be read without the first book of the series, as it is a stand-alone. But for a deeper understanding of the characters, you are free to check out Book 1 of The Nox Bloodline series. Book 1: Lycan Brothers Want Me Book 2: Betrayed By My Lycan Sister, Became A Villain