¿Most immaterialists are a little mad. If you ever meet one, you should be most careful to keep your fingers crossed.¿ American-born John Wilson and his troop of distinguished friends were well known in the fashionable parts of London. And at their social gatherings the very latest fad was ¿Immaterialism¿, and the quest for the perfect immaterial work of art ¿ but what they hadn¿t expected to find was the perfect immaterial murder.