Novella about a meeting between Gottfried Leibniz and Baruch Spinoza, that wanders through questions about class, language, antisemitism, desire, philosophy, and god. It's relentlessly thought-provoking and affecting, packing a lot into its 70 pages. The volume includes Delany's justly famous essay on "Racism and Science Fiction," and a recent (2018?) interview with Terry Bisson.