The first bomb was detonated in the subway - the Pimlico underground station - causing massive damages and killing many lives.
Zak is then asked to rescue a young computer hacker Malcolm Mann, who is currently locked away in a hospital in South London to help locate the third bomb. Apparently, Malcolm has broken into the CIA, Pentagon and Department of Defence intranets and boasts about it in his personal blog. The Americans are furious and want to put him on trial for breaching their security. Instead of handing him over, the British government placed him under the Mental Health Act to avoid extraditing him.
Meanwhile, Gabs teaches Zak a simple one-time pad code used by the Special Operations Operatives during World War II to read coded messages.
Zak, together with his mentors, solve the following day’s crossword puzzle and look for the message hidden in it. Using the one-time code, they identify the target of the second bomb - St Oswald’s Children Hospital - located on the bank of the Thames. Immediately, they inform Michael who alerts the police to carry out a speedy evacuation.
He suffers moments of helplessness as he races against the clock alone when both Raf and Gabs are grabbed by the terrorist. They are taken to the underground tunnel beneath Buckingham Palace, which is the location of the third bomb. Zak knows about this location after analysing the message hidden in the report written by Rodney Hendricks, the editor whom Zak works under at the Daily Post. Michael has earlier sent him there as an intern to keep an eye on another staff member, Joshua Ludgrove.
They also identify the terrorist as one of the two brothers - Richard and Lee Herder - who were two highly accomplished bomb-disposal experts working in Northern Ireland 40 years ago. Richard was killed after he was ordered to defuse a device under a car that he himself had declared unsafe to approach. Unfortunately, the Ministry of Defence covered up his death and the circumstances surrounding the car bomb that caused it. Subsequently, Richard’s brother, Lee disappeared.
A slow start at the beginning but the excitement picks up towards the ending. Another interesting thriller from Ryan for fans of Agent 21.