Detective Kim Stone rushes to a burned-out house, inside which the bodies of two teenage children and their parents have been found. However, it was not the fire that killed them, but the bullet. And the murderous weapon is held in the hand of mother Helen Daynes. The case evokes painful memories of her childhood in Kim, the more she wants to uncover the truth. He then discovers a small, crucial clue in Helen's bedroom that suggests someone else may have killed the entire family. The four coffins have been filled, but it's not over yet...