Tavia and Effie are not-blood-sister-sisters. Tavia is a siren, who must keep the fact she is a siren under wraps. Effie is not a siren, but is plagued by events which happened when she was nine, the loss of her mother, and currently lives with Tavia as they go to high school together. While Tavia is trying to figure out how to permanently silence her voice so as to stop fearing what will happen if people find out about her, Effie is struggling with not knowing who she is...