At 11:47pm, a message arrives from a number that doesn't exist: Platform 3, Victoria Docks. Seven days. Come alone. He left his old life behind, or so he thought. Someone else hasn't forgotten it.
Then the clues begin. A strangers warning. A photograph with blood on it. A train on the line that closed years ago. Each one was placed for him to find.
And when the clock runs out, the story starts again from the other side.