Thestakesareraisedinseasontwoof"MI-5",asthethreattonationalsecurityincreasesandtheneedtothwarttheterroristsoperatingwithintheUKbecomesmoreurgent.TomisinvestigatingaSerbianterroristplot.HisgirlfriendandherdaughteraretrappedinTom’shousewithalap-topwhichisthoughttocontainabomb.MeanwhileanotherbombisprimedtoexplodeandthisonekillstheSecretaryofStateforNorthernIreland.Addingtothepossibledangersfacedbyothergovernmentofficials,TomlearnsfromhisAmericancolleaguethatanassassinisintown,theCIAknowabouthimbuttheyhaven’ttoldMI-5没想到胡彦斌不仅会唱歌，对于婚姻还是有点工具的，我竟然被他“因为我把更多的时间拿来陪你，所以你看到我跟你在一起的时候，会手机不离手。而分隔的时候，回动静不及时是因为我想更高效的干工作。”的不雅概念说服了。