Detective Kate Linville chooses to use her last weekend off before joining the North Yorkshire police to visit the spa that her Scotland Yard coworkers have gifted her as a farewell present. When a girl appears, being pursued by a man brandishing a gun, Kate is sitting on the train headed to her destination. The bullet's course is changed by the detective's swift action, but the stranger runs away. A mountain bike accident involving a teacher occurs a few days later as a result of a wire that was left in the road. After the young woman hits the ground, a shot can be heard. The firearm used in both incidents may be identified by looking at the cartridges that were seized. Although the two women did not know one another and there is no obvious connection between them, the police are certain that the two instances are connected and may even be the work of the same individual. Or if? Unaware that her life is in jeopardy, Kate Linville takes care of the investigation right away.