Grace Isabel MacKenna has a hundred things to do today. Killing someone isn't one of them. It is supposed to be a quick visit to Boston for the Buchanan anniversary party, then on to Scotland to collect an inheritance. She checks into her hotel and then decides to go for a brisk walk. But after getting lost, she ends up with a wounded man stumbling into her arms--and his shooter coming after them both. When she fires back in self-defense, she doesn't expect him to drop dead. After Isabel endures an interrogation by police, she is free to go, thanks to the Buchanans dispatching former Navy SEAL and now lawyer Michael Buchanan to assist her.

Isabel knows she should be grateful for Michael's help, but since she's harbored an extreme dislike for him for years, gratitude is difficult to muster. Michael has appointed himself her de facto guardian, and she's stuck with him despite their constant bickering and sizzling attraction. Even when Isabel goes to Scotland to claim her inheritance, Michael follows her--but he isn't the only thing she can't shake. Mysterious threats against Isabel surface, and before they can deal with their growing feelings for each other, Michael and Isabel must first survive.