A married couple deals with the husband's decline from Lewy body dementia in a profound and deeply moving novel shot through with Kirshenbaum's lacerating humor. It begins with hallucinations: of a man on stilts, an acting troupe, Ghandi. At first, these seem benign, almost comical, and are likely connected with an ocular issue. It's something he and his wife can make jokes about. But soon he starts to experience other cognitive symptoms,...