Ammonite is Nicola Griffith's first novel, published in 1992 (ISBN 0-345-37891-1). It won both the Lambda Literary Award for LGBT (lesbian, gay, bisexual, transgendered) fiction, and the James Tiptree, Jr. Award for science fiction or fantasy that explores or expands our understanding of gender.
Ammonite is the story of Marghe Taishan, an employee of the sinister, monolithic 'Company', sent to the planet GP (pronounced 'Jeep') as an anthropologist. The distinctive feature of Jeep is an endemic disease which kills all men (and some women) who contract it. While testing a vaccine made to protect unexposed people form the virus, Marghe makes a journey across Jeep, living with many of its indigenous cultures. She is enslaved by the nomadic Echraide, and then reaches the quieter village of Ollfoss, where she joins a family, learns the mystic discipline of linking, and eventually becomes a 'viajera', or traveling wise woman, giving up the vaccine in favor of accepting the virus into her body and truly learning what it is like to be a native. Afterward, she is forced to the center of a conflict between her former people, the Mirrors, with their native allies and the Echraide, who follow a