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The team at MI5 are guarding an emergency Middle Eastern peace summit in London, following an Israeli attack on Gaza, when they discover that a key part of an assassin’s toolkit is being sold online, kicking off a urgent mission to retrieve it. Lucas pinpoints the vendor as teenager Dean Mitchell, who got hold of the murderer’s kit bag after witnessing an assassination…

While visiting Dean, Lucas spots an armed snatch squad waiting outside, and realises that it’s not just MI5 interested in Dean’s goods. Back at the Grid, the team learns that MI6 were planning to assassinate the Chief UN Negotiator, who was in London for the summit – and that a photographer who threatened to expose their plans was killed – right before Dean’s eyes.

Knowing that Dean witnessed the murder and suspecting he has the photos, MI6 is hot on Dean’s trail. Can Lucas and the rest of MI5 lead the boy to safety?

Also, Harry gets a message from a Russian sleeper agent, who has details of the mole who tries to sabotage a 20-year British intelligence operation. As Harry opens the file disclosing who the MI5 traitor is, Harry is shocked by what he sees…