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Zoe finds herself in the Turkish embassy just as it's taken siege by Kurdish rebels. Meanwhile, Tessa proves herself to have some dark secrets in her past.

Working undercover, Zoe attends a function at the State Consulate of Turkey. Whilst still inside, the building is dramatically stormed by heavily armed Kurdish freedom fighters. Led by the beautiful Leyla Ahmed, the terrorists demand the release of fellow paramilitaries back home.

The Kurds use the threat of violence to impose a siege. Tom and Danny mount a surveillance operation to gather intelligence by feeding optic cables into the barricaded room. Surprisingly though, counter measures have been put in place, so it takes time to establish a link.

Back at the Grid, Tessa is stunned and confused to see a man whom she thinks is Johnny Marks, a former British spy and secret lover of hers, in the CCTV footage taken before the siege. Marks was supposedly killed in a car accident fifteen years ago. Tessa convinces Harry that it is Marks – he’s clearly alive, and connected to what is happening inside the State Consulate.

At the siege, the situation deteriorates as the KurdsÂ’ nerves fray. While the Attache General, wired to a bomb and placed outside on a balcony, begins to show signs of being unwell, Leyla Ahmed finds equipment in ZoeÂ’s handbag that makes her suspicious. Harry is horrified to discover that they have a second hostage situation. Johnny Marks has abducted the daughter of a banker who administrates the Ministry of Defence payroll. The bankerÂ’s identity is known only to a handful of people, but somehow Marks is now one of them. The bank contains information on all of MI5 and 6Â’s undercover agents, as well as millions of pounds. The security breach could be catastrophic.

The bank in question is five doors down from the State Consulate of Turkey; Harry surmises that Marks provoked his Kurdish contacts into staging the siege to create a diversion. Back from the dead, MarksÂ’ real goal is theft, and access to every agentÂ’s name and details. Tom and Danny finally find a way to secure ZoeÂ’s safety, but Tom is shot! Luckily he'll live. Before Johnny Marks escapes he pays a visit to Tessa, who informs him she once was pregnant with his child. This shocks Marks and instead of using the information to bring British intelligence to its knees, he has a change of heart, leaving with only the money.