Underwater love - MaryJanice Davidson

Sleeping with the Fishes

Fred is a mermaid. But she's not blonde, or buxom, or even perky. In
fact, she can be downright cranky-especially when weird levels of
toxins are found in the local seawater. There is one perk: Thomas, the
gorgeous marine biologist helping in the investigation. If you thought
it would be easy for a mermaid to get to the bottom of things, think
again.

Swimming Without a Net

To visit the undersea realm of Artur, the High Prince, and her royal
merfamily, Fred's brought along Thomas to explore where no "lander" has
gone before. But Fred is soon caught between two factions of merfolk:
those happy with swimming under the radar-and those who want to bring
their existence to the surface...

Fish Out of Water

The existence of the Undersea Folk is no longer a secret, and someone
needs to keep them all from floundering in the media spotlight. Fred
and Artur have all the right skills for the job, if not for staving off
an impending civil war. But all the while, Fred has something else on
her mind: the sexy human landlubber she left behind...