Road Trip With a Rogue by Kate Bateman

Mistakenly holding up the coach of the man who broke her heart is bad enough, but having to endure his sinfully alluring company all the way to Scotland is Daisy Hamilton’s worst nightmare . . . and her most secret desire.
A midnight mishap.
Daisy Hamilton’s new mission for King & Co., London’s premier private investigation firm, is simple: stop heiress Violetta Brand from eloping. But her case is derailed when she mistakenly holds up the carriage of Lucien Vaughan, Duke of Cranford—cynical war hero, infamous libertine, and the very man who broke her heart five years ago.
A reluctant road trip.
Lucien’s determined to see his lovestruck nephew married to Miss Brand, but the unexpected appearance of Daisy— the one woman he’s never been able to forget—could ruin his plans. As they follow the runaway couple together, Lucien decides that delaying the headstrong Daisy by any means possible—including seduction—will be his absolute pleasure . . . and hers.
A dangerous desire.
After Daisy’s reputation is threatened, Lucien makes a scandalous claim, but when an unexpected enemy threatens her life, he realizes she’s the only woman for him. Their past encounters have made Daisy almost as jaded about love as Lucien himself, and it’s going to take action, not words, to convince this knife-wielding hellion to risk her heart on him again…