A family is gunned down in the snow but one of the children survives. Three years on, that child takes revenge and the Snow Killer is born. But then, nothing - no further crimes are committed, and the case goes cold. Fifty years later, has the urge to kill been reawakened? As murder follows murder, the detective team tasked with solving the crimes struggle with the lack of leads. It's a race against time and the weather - each time it snows another person dies. As grizzled and exhausted DC Barton and his team scrabble around to put the pieces of the puzzle together, none of them think to look closer to home, where the killer is hiding in plain sight.