This new 6 part series follows investigative journalist Donal MacIntyre & Prof. David Wilson as they take us on a shadowy journey inside the minds of Ireland’s contract killers. The first episode kicks off with a profile of Irish criminal Paddy 'The Whack' Doyle, who fled to the Costa del Sol after the Criminal Assets Bureau was established in 1996 and is known as one of the most violent and feared criminals once operating in Dublin.