Vanessa Kirby meets a spy who infiltrated the political wing of the Irish Republican movement. Willie Carlin risked his life in Derry, Northern Ireland, on a daily basis to provide the UK with intelligence that could help to end decades of violence and killing. How far would YOU go for peace? From SPYSCAPE, the home of secrets and skills. A Cup And Nuzzle production. Series producer: Gemma Newby. Produced by Joe Foley. Music by Nick Ryan