"There's always a good murder around if ye know where to look for it," declares Professor John Stubbs. "It may be masqueradin' as accidental death or suicide," he solemnly adds, "but once ye start rootin' around ye'll find that it's murder." And murder it is, on public display in London's controversial new modern art museum. When the unveiling of a contemporary masterpiece reveals the body of a prominent art dealer dangling from a picture hook, Professor...