Entwined With You by J. Kenner

Braxton Reed has reinvented himself, first burying his past as a con man and thief in order to join the FBI, and now working for Stark Security. But he can’t forget the years he spent with the love of his life, Sabrina. A vibrant woman with a mind as keen as his own, she was killed during a job gone bad, leaving Brax afraid to love again and determined to turn his life around. He’s on the right side of the law now, but when Sabrina’s sister, Samantha, walks into his life, the past comes rushing back.
Samantha is about to pull the biggest heist of her life, but she can’t manage it without Brax’s help. What she doesn’t know—and what Brax can’t tell her—is that Stark Security has been hired to protect the same treasure. And there is no way he’s letting Sam steal it, no matter how hard he’s begun to fall for her. But it’s not just the treasure that Samantha wants. She wants Brax, too. Because there’s one more secret that she knows and he doesn’t, and it’s a secret that will change everything.