Katie Douglas and Casey Malone are off to spectacular Lake Louise in the Canadian Rocky Mountains. Casey has been invited to be the keynote speaker at the biennial convention of the North American Mystery Writers. They are looking forward to some extra time enjoying the grandeur of the mountains, including a trip aboard the Cascade Mountaineer excursion train for a Murder Mystery Adventure. During the convention it becomes apparent there are hostilities between several of the participants, and what seems to be a skeleton from Casey's closet makes an appearance. When they board the train for the excursion, the murder mystery begins. However, it soon becomes apparent that the mysteries are not all theatrical. Bodies pile up and the train gets highjacked. Before they can return safely to Lake Louise, Katie and Casey must thwart the hijacker and uncover who is behind Murder on the Mountaineer.