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Callahan Billionaires
Series · 3 books · 2024-2025

Books in series

By His Vow book cover
#1

By His Vow

2024

An all-new steamy and angsty billionaire arranged marriage romance from the USA Today & Wall Street Journal bestselling author, Tracy Lorraine. As the daughter of a powerful businessman, I wasn’t expecting to inherit much when my father suddenly passed. There was only one thing I truly wanted. The cottage—the only place that ever felt like home. But it turns out that I got a lot more than I bargained for. Kingston Callahan. Arrogant, egotistical, power-hungry, demanding and all the other not-so-charming attributes I despised. He’s also my brother’s best friend. And now, thanks to my dearly departed father, my husband for the next year. He’s everything I hate about the life I was born into. Everything I’m not. One short year...three hundred and sixty-five days in return for the life I've always dreamed of. It’s a merger, not a marriage, but I’m not prepared for the hunger Kingston uncovers with his touch. It’ll all be over soon, just so long as I remember not to catch real feelings for my fake husband while we’re pretending. _Dear reader, By His Vow is a standalone enemies to lovers, brother's best friend romance set in the Callahan Billionaires world._
By His Rule book cover
#2

By His Rule

2024

An all-new steamy and angsty billionaire fake dating romance from the USA Today & Wall Street Journal bestselling author, Tracy Lorraine From the wrong side of the tracks to the heart of a billionaire… Leaving my hometown, I chased a single dream: work for Callahan Enterprises and build a better life for my brothers and me. The allure of city life, with all its glitz and glamour, promised a fresh start. I was determined to leave my past in the rearview mirror. But I didn’t bank on my demanding new boss. Kian Callahan is everything I can’t stand: entitled, arrogant, overbearing—not to mention a charismatic playboy. And the worst part? He’s also my best friend’s brother-in-law. I hate knowing that I only got the job because of her. I pride myself on carving my own path, and the last thing I need is a power-hungry a-hole getting in my way. Too bad my body didn’t get the memo, because the chemistry is undeniable. And my attraction to the ruthless CFO… well, it’s downright infuriating. As much as I hate to admit it, he might just be everything I never knew I needed. Even if I don’t want to. Dear reader, By His Rule is a standalone fake dating, workplace romance set in the Callahan Billionaires world.
By His Play book cover
#3

By His Play

2025

An all-new steamy and angsty billionaire friends to lovers fake engagement romance from the USA Today & Wall Street Journal bestselling author, Tracy Lorraine Kieran Callahan is every woman’s fantasy—charming billionaire, star running back, and heartbreakingly handsome. He’s also my best friend. When my grandmother’s final wish puts me in an impossible situation, I tell the biggest lie of my life: Kieran and I are engaged. I planned to tell him the truth—really, I did. But before I can come clean, a nosy nurse and a sleazy tabloid blow up my little secret. Now, the media’s in a frenzy, and instead of setting the record straight, my best friend turned fake fiancé agrees to play along. All for Grams. But spending so much time together blurs the lines we swore we’d never cross. And I’m seeing him in a whole new light. Suddenly, Kieran isn’t just my best friend. He’s the man who makes my heart race. The one I can’t imagine my life without. We only have a few days before everything goes back to the way it was… But what if I don’t want it to? _Dear reader, By His Play is a standalone fake engagement, friends to lovers romance set in the Callahan Billionaires world._

Author

Tracy Lorraine
Tracy Lorraine
Author · 113 books
Tracy Lorraine is a M/F and M/M contemporary romance author. Tracy has just turned thirty and lives in a cute Cotswold village in England with her husband, baby girl and lovable but slightly crazy dog. Having always been a bookaholic with her head stuck in her Kindle Tracy decided to try her hand at a story idea she dreamt up and hasn’t looked back since.
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Callahan Billionaires