When a baby is born whose reproductive organs do not fit neatly into a binary idea of biological sex, they are deemed intersex. Often, doctors and parents decide to do surgery soon after birth, and in many cases administer hormones, to make intersex children fit into male/female categories. Intersex is treated as a medical problem: their physiologies are quickly dismissed as impossible, freakish, or even monstrous. Hermaphrodite Logic places the sexually indeterminate at the centre, for a change. Jules Joanne Gleeson offers a fresh perspective for understanding, speaking of, and celebrating indeterminate lives. Rather than focus on ‘ambiguity’ (or its still vaguer variant, ‘fluidity’) Gleeson focuses on indeterminacy–the bodies, sentiments and experiences that can not be folded in two. The indeterminate cannot help but exist between categories. Hermaphrodite Logic foregrounds the experiences of sexually indeterminate figures both current and historical, and seeks to build up a thoroughgoing case for our emancipation.