Lord Peter West and Lady Rose Finch have returned from the district of the Merpeople. They knew their welcome would be rocky, but had not prepared for the challenges that awaited them at home.

When Peter learns that Lady Meredith, the woman he spurned, could be in danger, his conscience moves him to find her. But these plans are interrupted by the death of the Ocean Queen and the chaos that ensues.

The heir to the Ocean Throne, Prince Sorley, has been locked in prison for years. Enraged by the separation, the ocean begins calling to him. As furious raindrops threaten crops and sink ships, Rose and Peter must find a way to rescue Sorley from prison.

Can he be freed before the chaos is irreversible?