Fred the mermaid has taken the bait and chosen Artur, Prince of the Black Sea, over human marine biologist Thomas. And just in time. The existence of the Undersea Folk is no longer a secret, and someone needs to keep them from floundering in the media spotlight. Fred has all the right skills for the job, but not for when her real father surfaces and tries to overthrow Artur's regime.

However, as civil war threatens to sink the merfolk, Fred can't stop thinking about the landlubber she left behind...