Birds of a feather

the long version

"A fortunate man, Sir Anthony Swale is married to a loyal wife; he lives in a grand house in Somerset and leads a very privileged life. He devotes most of his time to collecting rare art treasures, particularly from behind the Iron Curtain. And he will pay any price for the right piece - including treason. But then his treachery is discovered - and agents working for the Government decide it is time to take discreet action."--Publisher description.