A year has passed since DI James Walker cracked his biggest case yet, and he's hoping for peace and quiet this festive season. But across the fells, a local farmer returns home on Christmas Eve to find footsteps in the fresh snow that lead down to his unused basement - and no footsteps leading away. Days later, his body is found, alongside those of his wife and daughter. Without a neighbour for miles, there are no witnesses and little evidence. And the crime scene has strange echoes of another terrible murder committed at the farmhouse, twenty years earlier...