Reading 'The Third Sex' feels a bit like flying in a veering helicopter over a rain forest that is disappearing before one's eyes.

In her previous novels, Maggie O'Farrell has often measured the distance between intimates and the unexpected intimacy of distance - geographic, temporal, cultural. In 'The Hand That First Held Mine' and 'The Distance Between Us,' characters separated by many miles or many years turn out to be joined in ways they never anticipated.

The spirits of Havelock Ellis, Magnus Hirschfeld and Richard Freiherr von Krafft-Ebbing waft through the text to lend 'The Third Sex' an air of scientific authority.

Stacey D'Erasmo Quotes