The man in the corduroy suit
(Book)

"British intelligence is in a state of panic. Cracks are appearing, or so a run of disciplinary cases would suggest. To cap it all, a retired MI5 officer collapses, the victim of what looks like a Russian poisoning. Leonard Flood is ordered to investigate--and quickly. Notorious for his sharp elbows and blunt manner, Leonard's only objective is to get the job done, whatever the cost. But when the trail leads him from the suburbs of London to a remote country hotel, he makes a startling discovery that will change his life forever."--Back cover