Investigating Richard III, Tony Robinson was shown evidence to suggest that the royal line was tainted by the illegitimacy of Edward IV. So who should be sitting on the throne today? Tony tries to find out in a detective story that takes him from the Tower of London via Debrett's Peerage to ruined castles and family tombs in Scotland and Ashby de la ZouchInvestigating Richard III, Tony Robinson was shown evidence to suggest that the royal line was tainted by the illegitimacy of Edward IV. So who should be sitting on the throne today? Tony tries to find out in a detective story that takes him from the Tower of London via Debrett's Peerage to ruined castles and family tombs in Scotland and Ashby de la Zouch