Lars Horn’s Voice of the Fish (Graywolf), the latest Graywolf Press Nonfiction Prize winner, is an interwoven essay collection that explores the trans experience through themes of water, fish, and mythology, set against the backdrop of travels in Russia and a debilitating back injury that left Horn temporarily unable to speak. In Horn’s adept hands, the collection takes shape as a unified book: short vignettes about fish, reliquaries, and antiquities serve as interludes between longer essays, knitting together a sinuous, wave-like form that flows across the book. Horn swims through a range of subjects, roving across marine history, theology, questions of the body and gender, sexuality, transmasculinity, and illness. From Horn’s upbringing with a mother who used them as a model in photos and art…