Sean O'Callaghan was the most highly placed informer within the IRA. Under constant threat of IRA revenge, he now works ceaselessly for peace in Ireland. The Informer is Sean O'Callaghan's story.
'A book of major significance...told with the suspense of a thriller' -- Mark Kenny * Daily Express * 'A cracking story...O'Callaghan is one of the greatest friends of peace in Ireland' * Observer * 'An extraordinary memoir of life within the murky world of Republicanism...filled with astonishing insights into the personalities and politics of the Provisionals' -- Kevin Toolis * Guardian * 'The extraordinary story of an extraordinary man...His well-written book sheds an unprecedented light on the inner workings of the ""Republican Movement""' -- Conor Cruise O'Brien * Sunday Telegraph *