Season 2, Episode 1:
A car bomb kills the wife and daughters of the Secretary of State for Northern Ireland, then a British army base is attacked. When the Irish terrorist group denies responsiblity for the second blast and Bosnian war criminal Miroslav Gradic is spotted flying into the UK, the team realizes this could be the start of a revenge campaign. Zoe is tasked to befriend a possible weak link at the Serbian Embassy -- a cipher clerk -- whom they suspect of sending coded messages to the war criminal. Two more UK military targets are hit.
Missed this episode? Need some Cliffs Notes? Read our recap here.