There are 4 books in the The Billionaires series. The newest book is The Billionaire's Bodyguard which came out in 2018.

Self-made billionaires Zane and Trey have been a club of two since they were eighteen. They’ve done everything together: play football, fall in love, even get smacked around by their dads. The only thing they haven’t tried is seducing the same woman. When they set their sights on sexy chef…
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2
Beck and Call

Book cover of Beck and Call
Women can’t keep their hands off billionaire Damien. The mysterious mogul has it all: fast cars, killer looks, and a brain that just might be his best asset. Mia loves her job at a PI firm. Her coworker Jake stars in most of her daydreams, so seeing him every day…

3
Lord and Master

Book cover of Lord and Master
My name is Mia, and I’m a lucky girl . . . Billionaire Damien didn’t magically stop being moody just because Jake and I moved in with him. Fortunately, I've devised a strategy. I inherited a share in an exclusive erotic club, and they’re beta testing a role-play game. Surrounded…

4
The Billionaire's Bodyguard

Book cover of The Billionaire's Bodyguard
A.J. is as cynical as she is badass, a former cop turned bodyguard. A lifetime of hard knocks taught her not to trust—a handy trait in her line of work. Given the right motivation, she knows anyone will betray their near and dear. Rather than let them betray her, A.J.…