All Giselle Chekhov cares about is securing the principal role in the ballet for which she was named, but her Russian grandmother warns that the ballet, featuring cruel siren-like maidens, will draw the vain creatures back to town. Every decade or so, sirens swarm to Foulweather, Oregon killing indiscriminately and then vanishing again. At the same time that her dreams for the stage are falling apart, Giselle begins to suspect just who the sirens are really after.