An Instructive Mountie: Adventures of the First Woman Mountie. Book 12

When RCMP Corporal Alexandra Houston and her police-service-dog partner Silver are called to the scene of a train derailment in Central Canada, the horror of the devastation is magnified by their discovery that it was intentionally caused; and by a bomb. The bombing turns out to be the first of many, leading Alex and Silver across Western Canada as they try to figure out where the next strikes will occur - and how to stop them.