When an IRA Stormont spy ring was alleged in 2002, devolution quickly plunged into crisis. A PSNI raid on Sinn Féin's Stormont offices discovered a map of castle buildings with instructions on bypassing security, and intelligence on the prison service, including personal details of prison officers. But in 2004, Denis Donaldson – the most senior republican arrested during the raids – admitted he had been a British agent all along. Months later he was murdered in Donegal. 

Belfast Telegraph’s Northern Ireland Editor Sam McBride has been back in the archives and has unearthed fresh details on the Stormont spy ring scandal, he joins Ciarán Dunbar.

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