Seductions of a Duke’s Daughter by Samantha Holt

They’ll work together, but love is not part of the plan. Or so they assumed… Men have no interest in Eleanor, and she has no interest in them. The handsome rake who spends entirely too much time trying to charm and seduce her is no exception. Which makes it all the more frustrating that she must now work with him to determine who is attempting to ruin her sister’s wedding… Lord Oliver Hart, Viscount Ashford hasn’t a clue what he did to make an enemy of Ellie. But he has no doubt he’ll win her over eventually. For now, he’ll focus on uncovering who has been trying to sabotage his best friend’s wedding. And if the investigation also helps him win over his prickly little wallflower…all the better. When a dedicated spinster and a confirmed bachelor join forces to solve a mystery, is happily ever after even a possibility?