Beyond the Highland Mist ~ Karen Marie Moning

This is the first book in the Highlander series. Adrienne is a modern woman, living in 1997, when suddenly she finds herself sitting in the lap of a man in 1513. She is soon informed that she will be married the next day. Sidheach Douglas is Laird of the Douglas clan... in 1513, and is known far and wide, as a ladies man. Can the two of them come to terms?