Early on the morning of December 30, Takeshi Tsuchida got down on his knees to carefully place flowers in front of a black-slab tomb marking the last resting place of Mikio Miyazawa, his wife and their two children.Tsuchida bowed his head, clasped his hands together and offered a silent prayer.Now 78, Tsuchida has retired as head of the Seijo police station in Tokyo’s upmarket Setagaya ward, but he has never been able to move on from the one crime that still hangs over his career.“Twenty-five...