The Grail Tree (Lovejoy Mystery)

"In the world of antiques the Holy Grail is a holy terror - for almost every month someone claims to possess the original. So when an inebriated ex-clergyman confided to Lovejoy that he did indeed possess the cup, the resourceful antiques dealer knew just what to make of such a statement. The trouble was that someone else thought this version of the Grail was worth stealing - and now the owner was dead amid considerable carnage."