To deceive a highlander : The Sutherlands of Dornoch, #1

He married the wrong sister. . . or did he? Laird Haydon Sutherland has made up his mind. 'Tis time to marry and he has offered marriage to Lady Elsbeth Johnstone, a quiet, demure lass who will never cause him a day of worry. Lady Ainslee Johnstone, Elsbeth's feisty, stubborn twin will not allow the marriage to take place. The arrogant, fierce Sutherland will destroy her sweet sister, so they switch places on the wedding day. Let the battles begin...