ucas goes undercover aboard a merchant ship on which a known member of Al Qaeda is traveling to the UK. The ship is soon taken over by terrorists and it becomes clear that they are planning a coordinated attack of some sort. Lucas isn't the only MI-5 agent on board but Lucas' main help in the operation comes from a private security officer, Beth Bailey. Back in London, Harry Pierce has a particularly difficult encounter with the former Home Secretary, Nicholas Blake. Harry decides that it's time to retire but is again faced with making life and death decisions.

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