Freddie Scappaticci led a double life – spyhunter for the IRA and, at the same time, one of Britain's most important spies inside the group. His ability to interrogate IRA gunmen and bombers gave him unique access to their secrets – information that could be fed straight back to their enemies. But his IRA role also meant he was a killer. Jennifer O'Leary investigates.

Mandy McAuley investigates a deadly new wave of street drugs and finds out about the risks posed by dealers.