Keeping Kate by Sarah Gabriel

The brazen beauty is said to possess fairy magic, and has successfully charmed and seduced English soldiers out of their most carefully guarded secrets to aid her kinsmen. But now the infamous Kate MacCarran has met the one man who seems immune to her legendary allure ...

Captain Alec Fraser of The Black Watch has no doubt that Katie Hell is trouble. Hadn't she just drugged him, kissed him, then searched through his belongings? Now the elusive spy is his captive, and it is Alec's duty to transport her to Edinburgh. But the Highland hellion challenges him at every turn, determined to escape with her secrets. Soon Alec discovers that keeping Kate out of mischief may be an almost impossible task ... just as Kate realizes that surrendering to his passionate love may be her most dangerous mission yet.