The year is 2132. In the Scottish Democratic Republic violent crime has been virtually eradicated; indeed no murder has been committed for over twenty years. Madeleine Connachan is a single mother of two on her way home from work when she pulls over to wait for the heavy fog to subside. A couple of hours later her car is found next to the roadside with the grizzly remains of a body inside. Chief Inspector James Wilkie is put in charge of the investigation. Confident and intelligent, with a keen mind that can operate outside the box, he is under pressure to get results, and fast. To complicate matters, two English soldiers have managed to cross the border undetected, causing a nationwide search. Christine Howie is the Secretary of State for Home Affairs in the Scottish Government. A hard-working politician, devoted to her family, she suffers from crippling osteoarthritis and work is a welcome distraction from the pain. She is a popular figure, approachable and kind, but hides a naturally fiery nature which shouldn't be crossed. As the story unfolds she is haunted by a face from the past, her late husbands' first wife. A dark figure, cigarette in hand, moves quietly along the backstreets of central Glasgow at night. In the daytime she is just like any other civil servant; sociable when she has to be, polite and efficient. But in reality she is an assassin. A soulless, cold-hearted killer who can strike anywhere, any time, and leave no trace. She is Shadow Walker. Through the eyes of these four people, indirectly linked to each other, the reader enters a world of darkness, paranoia and constant twists and turns as the hunt for the killer becomes more and more frantic.