It is Christmas 1912, and Charlotte McEwan is 15 years old. The coal-mining town of Extension, British Columbia, on Vancouver island has hit hard times. When the opportunity to work in a local dynamite factory presents itself, Charlotte braves the disapproval of her mother for the chance to bring in some extra cash and keep the vow she made to herself to get her family as far away from the mine as possible. But the job is more dangerous than she bargained for, and soon Charlotte is at risk in more ways than one.