Cyber-war is ripe for depiction in a thriller and Michael Dobbs has clearly researched the field. Unfortunately, in a world where the most devastating cyber-attacks have originated from private groups or criminal organisations, he's chosen to frame the tactics in the geo-political sphere and a result, the plot strains credibility.
The villain is China which, under a nationalist leader envisages bringing his country to global dominance while settling old scores with Britain, Russia and the USA. The unseen Mao Yanming acts through Fu Zhang, who has brought together a group of techno-geeks to bring China's enemies to their knees. Unfortunately Fu Zhang has too much of the Fu Manchu about him - his overt evilness and ambition making it difficult to take him seriously (despite a nasty opening scene). You also wonder why China doesn't go for cyber-espionage instead to maximise commerce opportunities.
China's initial attacks on nuclear facilities and medical systems have attracted the interest of British PM Mark D'Arby, who's arranges a secret meeting with US President, Blythe Harrison and Russian President Sergei Shunin in a remote Scottish castle to agree a strategy. Although the idea of the three leaders meeting in a remote spot without security is preposterous, the main problem is that nothing really happens. The leaders squabble and bargain but their talks have no impact on the plot's other events. Instead, Blythe mopes about her marriage break-up, Shunin bullies his son-in-law and D'Arby chats to Harry Jones, who as the hero is little more than an observer and driver until near the end when someone tries to sabotage the conference.
If you suspend your disbelief however, this is an entertaining enough novel. Events rocket along nicely and the action bounces between different events. A scene where the Sellafield nuclear plant begins to go into meltdown without anyone realising is chilling and the car bombing of Shunin deftly portrayed. Although the characters are brush strokes at best, Harry is suitably world-weary and morally upright to keep you rooting for him. I cringed at the scenes involving the Queen only because fictionalising real people is a personal squick. There's some reference to events in THE LORDS' DAY but you don't need to read it to understand this.
If you're looking for a decent beach novel, this is perfect but anyone seeking a thriller that examines the credible implications of the cyber-threat will find it wanting.