Danger by K.L. Ramsey

Bernadette Danger knew that the only chance to get her brother back might be a big, stubborn, Irishman who didn’t turn her on at all. Yeah, that last part was a total lie, but she was good at that—lying to herself. No one from her past life was willing to help her get Anthony back from the Dead Rabbits. Not her boss at MI6 or any of her so-called friends. Turning to Declan James and the Royal Harlots might not be her finest idea, but it was her only course of action if she wanted her brother back in one piece.
Declan James was tired of taking the Dead Rabbit’s beatings while they questioned him about where his little sister, Lilliana was. He knew exactly where she was—in America, probably at the same biker bar as their older brother, Cillian. He had heard a lot about the Royal Bastards over the years but never planned on visiting them—especially since he blamed their leader for letting Cillian end up in prison. Now, Lil was mixed up with them somehow, and he needed to get to America—fast. It didn’t matter that the Dead Rabbits were probably hot on his trail, he needed his family, and it was time to find them—consequences be damned.