Benedetta, who loved to talk scandal, claimed that Marcel had Williams syndrome. In his case, it was a deliberate derangement, an abnormal enlargement of Heschl’s gyrus in the primary auditory cortex. Marcel had hyperacusis and absolute pitch; he was a musician, and a sonic artificer for virtualities. The syndrome had also drastically boosted Marcel’s verbal skills, which made him an endless source of anecdotes, speculation, brilliant chatter, unlikely linkages, and endless magnetic trains of thought that would hit a mental switch somewhere and simply...