Stolen By the Billionaire by Blair Babylon

From USA Today bestselling author Blair Babylon comes a new edge-of-your-seat romantic suspense thriller between an Iowa farm girl and the ex-Navy SEAL billionaire who kidnaps her.
I am an American Navy SEAL, and I will not be blackmailed by a goddamn Russian mafia boss.
Years ago, I parlayed a loan into a billion-dollar crypto fortune. The head of the White Russian Syndicate is demanding I pay it back in illegal military-grade weapons, but I won’t. I will not be responsible for adding to the misery of innocents.

It’s time to hit back at the head of the White Russian Syndicate.
So I kidnap the mafia boss’s niece.
Who I did not realize is my best friend’s estranged little sister.
Who he’s never mentioned.
Not even once.
Sarah is a sweet little hayseed right off her Iowa farm, but when the mafia boss decides she’s a liability to eliminate, she becomes my responsibility to protect.
We’re on the run. But with each passing day, with each attack I defend her from, every hotel room with only one bed, I’m starting to fall for her.
The Russian mafia wants Sarah dead, and her brother is going to murder me when he finds out I’ve gone too far with his sister.