In an alternate modern America, Lily Mossberg, an anthropology lecturer at a rural New England university, has the ability to turn herself into a tiger. This ability is due to a sudden rash of genetic mutations, a "psi plague", of which shape-shifting is a rare and virtually unstudied variant. Lily must contend with her ex-husband, the powerful head of a pharmaceutical company, who is ignorant of her ability but who wants to make money off the...