Book 16 in the Zeb Carter Thrillers series
"Far-right armed thugs are rioting in the streets of London. An armed gang has surrounded Britain's House of Parliament and is lobbing explosives at it.... The heads of the secret intelligence services of many allied countries are meeting in London, simultaneously. Clare, Head of the Agency, Zeb's boss, is one of the attendees. That meeting is attacked by the rioters. And then, Zeb and his crew and their British friends get involved."