Rock Of Ages — Alexandra Duncan

When Megan Cameron, freelance journalist, suspects her hotel partner and beloved godmother, Amelia, of having unintentionally stolen the legendary Rock of Ages, an invaluable Celto-Christian treasure, from the Edinburgh Museum of Antiquities, she dismisses the possibility as ludicrous.
Their innocent calm on the Scottish island of Arran is disturbed by the arrival of three men. As events unfold, Megan is convinced that one of these men is responsible for switching the real Rock of Ages with the replica bought by Amelia. Even when the evidence points to Ben, Megan discovers she is hopelessly and dangerously in love with him.
Set among the diverse and lovely landscape of Arran, this romantic mystery blossoms with the double sting as Megan learns about trust, not only in others, but in herself.