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Knockout Hearts
Mason and Cornell McCarthy's Fighting Spirits and the Women Who Bring Them to Their Knees
Mason McCarthy, a retired boxing champion, has spent his life perfecting his tough, unshakable exterior. Beneath the gruff demeanor lies a man scarred by past losses and reluctant to let anyone close. When he meets Chloe, a curvy, brilliant chemist with a spark of unyielding optimism, Mason’s carefully guarded world unravels. Chloe’s intelligence and warmth challenge him in ways that leave him breathless—and for the first time, he’s tempted to let someone see the man behind the champion.Meanwhile, Cornell McCarthy, Mason’s older brother and an unstoppable force in the MMA world, is a fighter inside and outside the cage. Known for his discipline and single-minded focus, Cornell’s life turns unexpectedly when he hires Michelle, a no-nonsense, fiercely independent sports lawyer. Michelle is everything Cornell doesn’t know he needs—bold, passionate, and unafraid to stand toe-to-toe with him. Cornell finds himself drawn to her strength as sparks fly, but his fear of vulnerability threatens to keep him from fighting for what matters most.
As the McCarthy brothers face the women who’ve shaken their worlds, they must confront their fears, pride, and emotional walls. Chloe and Michelle aren’t just their matches; they’re their equals, pushing them to fight for love with the same intensity they’ve brought to every arena.
In Knockout Hearts, passion, vulnerability, and undeniable chemistry collide in a story about finding strength in surrendering to love. For Mason and Cornell McCarthy, the most significant battles are not fought with fists but with their hearts—and the rewards are worth every risk.
Mason McCarthy, a retired boxing champion, has spent his life perfecting his tough, unshakable exterior. Beneath the gruff demeanor lies a man scarred by past losses and reluctant to let anyone close. When he meets Chloe, a curvy, brilliant chemist with a spark of unyielding optimism, Mason’s carefully guarded world unravels. Chloe’s intelligence and warmth challenge him in ways that leave him breathless—and for the first time, he’s tempted to let someone see the man behind the champion.Meanwhile, Cornell McCarthy, Mason’s older brother and an unstoppable force in the MMA world, is a fighter inside and outside the cage. Known for his discipline and single-minded focus, Cornell’s life turns unexpectedly when he hires Michelle, a no-nonsense, fiercely independent sports lawyer. Michelle is everything Cornell doesn’t know he needs—bold, passionate, and unafraid to stand toe-to-toe with him. Cornell finds himself drawn to her strength as sparks fly, but his fear of vulnerability threatens to keep him from fighting for what matters most.
As the McCarthy brothers face the women who’ve shaken their worlds, they must confront their fears, pride, and emotional walls. Chloe and Michelle aren’t just their matches; they’re their equals, pushing them to fight for love with the same intensity they’ve brought to every arena.
In Knockout Hearts, passion, vulnerability, and undeniable chemistry collide in a story about finding strength in surrendering to love. For Mason and Cornell McCarthy, the most significant battles are not fought with fists but with their hearts—and the rewards are worth every risk.
242 pages, Kindle Edition
Published January 11, 2025
1 person is currently reading
7 people want to read
About the author
Sienna Kaye
8 books21 followersSienna Kaye writes steamy, emotionally charged romance that dares to explore the forbidden—where passion collides with power and love refuses to play by the rules. Her bestselling series, The McCarthy Affairs: Power, Passion, and Forbidden Desires, delivers high-heat drama, complex characters, and gripping plots that keep readers turning pages late into the night.
Sienna's stories feature bold heroines, alpha heroes, and sizzling chemistry wrapped in real-world challenges—from family dynasties and power plays to second chances and taboo temptations. Whether it's a billionaire falling for the one woman he shouldn’t touch, or rivals surrendering to undeniable desire, Sienna's books promise steam, stakes, and satisfaction.
When she's not writing, Sienna finds inspiration in travel, late-night playlists, and long beach walks. She’s also passionate about empowering readers to embrace love in all its messy, beautiful forms.
Connect with Sienna:
AllAuthor Profile Amazon Author PageGet ready to fall hard. Her books are available on Kindle and Kindle Unlimited.
Hi readers! I'm Sienna Kaye—writer of steamy, emotional, sometimes controversial romance.
Not every book is for every reader, and that’s okay. I write for those who love flawed, passionate characters, slow-burn tension, and stories that sometimes break the rules.
If you picked up one of my books and it wasn’t for you, thank you for giving it a shot.
If you loved it—I'm so glad you're here. Your support fuels every page I write.
Either way, I’m learning and growing every day. That’s the journey of an indie author, and I wouldn’t trade it.
💋 —Sienna
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