After a tornado devastates his Oklahoma farm, 15-year-old Shea moves to Cape Cod to live with his grandmother. Struggling to make sense of it all, he meets a girl along the shore who changes his life... forever.

the Son of a Mermaid series

Unrest stirs among the undersea clans, and tensions mount between Shea and his friends. The deceptions of both the past and the present have implications for everyone’s future. And at the root of it all… the magick that binds the undersea world together.

It started with a walk on the beach, when my fourth grader found a strange stone with a hole right through the middle. We talked about the mermaid who lost it, and the magical powers within the stone... three books later, the stories keep spinning.


I live on Cape Cod with my family and big dogs, and truly believe there are secrets and magick all around us, if we just take the time to slow down and look for it. When I'm not writing, you can find me walking my dogs on the beach or curled up somewhere reading. Books are a form of magick, letting us travel to other worlds and live other lives.


Dive into my undersea world...




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Katie O'Sullivan

Amazon Books

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Amazon Books

Wicked Whale Publishing.

Great characters who live off the page. Vivid realms that put reality to shame. Scattered words that transform into poetry. And brilliant stories that become unforgettable legends.


Click this link to find out more:

Wicked Whale Publishing
Amazon Books

When his girlfriend is kidnapped, Shea learns having royal blood means difficult choices. Life and death decisions are balanced precariously between doing what is expected, and defying authority to do what is right.

Welcome Mermaid Fans!