Scotland for Christmas (Harlequin Super Romance Series #1965)

These secrets won't stay hidden 

Jacob Ross needs Isabel Sage. She's a beautiful, brilliant heiress to Scotland's wealthiest family fortune—but Jacob isn't interested in her looks or money. Isabel holds the key to questions about his past. And when he gets a weekend assignment as her bodyguard, Jacob finally has a shot at getting the truth. 

But Jacob never expected Isabel to be anything other than a spoiled rich girl. Never expected to feel such a connection. And when Isabel realizes why he's really there, she'll be furious at being used. Jacob will have to convince her that she's become so much more than an assignment…