Spy on Me by Brittany Dreams

Beth was off limits. Which was fine by Steve. His life was complicated enough. But one night made her a distraction he needed to live without.
Steve works alone and undercover. No one know who he is or what he does except for Ken, his best friend. Ken confides in Steve that his wedding is in jeopardy when someone tries to blackmail the family.
And then of course there is Ken’s stepsister, Beth. A thorn in Steve’s side since they were kids. She has always been a bit stand offish to Steve and he wonders if she if behind this plot.
Will Steve be able to resist the temptation of Beth, his childhood enemy and risk it all?