Never embracing her mermaid heritage, Gwen Lonike lives in the human world as the owner of a Maine B&B. But when the gateway to a lost mermaid kingdom is opened, freeing its dangerous queen, Gwen can no longer hide, nor keep her secret from covert agent Blake Whittaker, who's assigned to trail a strange thread of paranormal activity.

How long can Gwen and her sisters remain safe from a destructive queen, and from Blake's superiors, whose ultimate mission could prove the greatest threat of all?