The prosecutor aiming to take down former Nissan chairman Carlos Ghosn is known as the “ace of aces”, a high-flyer in an elite special department that deals only with the most high-profile cases. Hiroshi Morimoto, who also enjoys a reputation as “Mr Clean”, has been in charge of the special investigation section of the Tokyo prosecutors office for just over a year, and now faces one of the biggest cases of his career.In his early 50s with black hair flecked with grey, Morimoto runs a team of 20 top officials investigating the complex and multi-faceted case of alleged financial misconduct by the auto industry tycoon. “It’s the cream of the crop of investigators,” said Yasuyuki Takai, a former member of the unit and now a lawyer.It was members of Morimoto’s team, dressed in dark suits, who rushed up the steps of Ghosn’s private jet at Haneda Airport and whisked him away for questioning. In his early 50s with black hair flecked with grey, Morimoto runs a team of 20 top officials investigating the complex and multi-faceted case of alleged financial misconduct by the auto industry tycoonGrainy images at the airport were captured by the Asahi Shimbun daily, and the surprise arrest stunned Japan and the business world in general.Takai said the special investigations unit was split into three sections, dealing with corruption, white-collar fraud and tax evasion. Only the first two are working on the Ghosn case, which does not involve allegations of fiscal fraud. The office has a record of securing high-profile convictions. Until now, the unit’s biggest case was arresting former prime minister Kakuei Tanaka in 1976 for his part in an immense global bribery scandal involving US aerospace company Lockheed.It also discovered and dismantled a complex cartel of firms involved in rigging bids for building a high-speed train between Tokyo and the western city of Osaka. Ghosn’s case has sparked huge international interest and led to criticism from abroad of the Japanese legal system, which allows authorities to detain suspects for long periods without formal charges.Published in Daily Times, January 12th 2019.