Something strange has happened to the public swimming pool in New Lourdes, Victoria. The water is no longer level and is rumoured to have curative powers. When sixteen-year-old Wolfgang Mulqueen takes a summer job at the pool, he meets Audrey, a blind girl who claims she's nocturnal. With the discovery of a butterfly unknown to science, and an unusual request from Audrey's father, Wolfgang finds himself inextricably drawn into an eighteen-year-old mystery, the tragic resolution of which will change his life forever.