The corporate culture at the agency for Locating and Assessing Magical Beings has deteriorated into suspicion and mistrust. When the life of top agent Fiona Maguire is threatened, her partner and secret lover, half-demon Lorcan Wright, convinces her to seek refuge in a time and place hidden from their enemies.

A beach vacation visiting family in the late eighteenth century is just the ticket-until one night Fiona sees a ghost ship sailing under a dark spell. When its vengeful captain beckons her, she insists on conducting an unsanctioned investigation, despite Lorcan's fears. With the help of Lorcan's former pirate brother Faolan and his wife Angelique, a transcendent water witch, they learn the ghost ship's captain is targeting Fiona-because of Lorcan.

Secrets from the past arise to complicate the mission, while in the present, the in-fighting at LAMB turns deadly. Enemies are everywhere, allies are scarce, and it seems their love is to blame. Will the fierce, ghostly captain drag them all to the dark depths to join his spectral crew? Or will Fiona and Lorcan's hard earned love weather the supernatural storm?