The Big Cases S01 E35 The Executioner Next Door

The quiet Irishman behind the high hedge had a history his neighbours could have never guessed: the man they knew as 'Frank' was really Freddie Scappaticci, a man with many secrets. Not only had he been an Irish Republican Army killer, he was at the same time an agent for the Army – perhaps their most important source inside the IRA, with access to their most sensitive secrets.