In regards to the ITV drama about Colin Howell, what journalist's account was used?
Colin Howell: Colin Howell (born 14 March 1959) is a Northern Irish convicted double murderer. Colin Howell:  The murders and surrounding story were the subject of an ITV drama series "The Secret" broadcast in April and May 2016. The Secret (TV series): The Secret is a 2016 Northern Irish ITV mini-series based on "Let This Be Our Secret", Belfast journalist Deric Henderson's account of the double murder of Lesley Howell and Constable Trevor Buchanan, whose bodies were discovered in a fume-filled car in the garage of a property in Castlerock, County Londonderry, in Northern Ireland in May 1991.
Deric Henderson