3 March 2016.
ISBN: 978-1-84866 (HB)
Hideo Yokoyama was born 1957. He is known for his career as journalist for the Jomo Shimbun, the regional paper in Gunma. Yokoyama specialises in mystery novels. In January 2003 he was hospitalised following a heart attack said to have been brought on by working constantly for 72 hours. Six Four is his sixth novel.