Who could be marking out a territory across town with cairns?The five children, now accompanied by several dissidents from the Clan of the Shark, have returned to Campton, where Ivan found some clues about the night of the Vanishing. One evening, as they are discussing the organisation of their new camp, the Master of Knives comes to ask for their help ... and collapses, gravely injured. Searching the city for what attacked him, the children are stunned to discover huge piles of objects covered in red paint…