The Westminster Disaster by Fred and Geoffrey Hoyle 2016

Just as a big river is formed by the confluence of many streams, so a massive affair like the Westminster Disaster was woven from many threads, threads which at first sight seemed separate from each other. It was while I was investigating one of the threads, connected with a Soviet agent called Morales, that I first met my wife. Her maiden name was Annette Osborne. Thereafter we continued the investigation together. It was an investigation with fragments in New York, Washington, South Africa, the Babushkin suburb of Moscow, and the very heart of London itself...