Patrick McCann, an Irish terrorist, promises Tom information on a planned attack on a nuclear power station. But there's a catch - MI5 must allow McCann's group to go unwatched for 30 hours.

Disgraced MP Hampton Wilder's memoirs, written whilst in prison, could create a scandal big enough to bring down the government - and the manuscript has gone missing. As Tom and his team try to distinguish fact from fiction, an ex-KGB spy is murdered and the manuscript is mysteriously leaked to the press. Tom begins to wonder who's really pulling the strings in this operation.

Danny and Zoe are sent to London as anti-capitalist demonstrations intensify ahead of President Bush's UK visit. Peter Salter is on an operation to infiltrate an anarchist group, but Tom suspects his motives.

While at the Turkish Embassy, Zoe is caught up in a siege by the Kurdish Liberation Army. Led by Leyla Ahmed, the rebels demand Kurdish prisoners be released from Turkey in return for hostages.

Race riots are becoming a national problem; MI5 are sure that businessman Robert Osbourne is responsible. Tom recruits MI5 secretary, Helen, to befriend Osbourne's wife and recruit her as a source.

Tom is informed of 20 bombs that have gone astray in Liverpool. Minutes later a car bomb kills a family-planning doctor and their daughter. Can the team find the remaining 19 bombs before they go off?