Get Swept Away to Cape Cod
Small Town Romance for Adult Readers
Mermaid adventures for
Teens & Preteens
Get Swept Away to Cape Cod
Small Town Romance for Adult Readers
Mermaid adventures for
Teens & Preteens
The Son of a Mermaid series has a new look for Summer'26
When 15-year-old Shea is uprooted from his life in Oklahoma and brought to seaside Cape Cod, he discovers his bloodline runs deeper than the ocean itself and quickly finds himself caught in an undersea war, determined to help the unlikely girl who has stolen his heart...
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Here's what people are saying about Katie's books...
Well written story and well developed characters! I was engrossed from the very beginning to the last word! Loved it! 5 stars!
- Amazon Kindle Customer
This book hit all the marks for me: a heroine who pursues her passion, a hero who's willing to take risks for love, and a storyline I found intriguing...5 stars for another winner from one of my favorite writers.
- Peggy Jaeger, award winning author
Ghost in the Machine is a gripping paranormal thriller I couldn't put down... Katie O'Sullivan grabs the reader by the lapels and doesn't let go until the last page. I love a good paranormal thriller but this one took me by surprise... if you're looking for romantic suspense with paranormal elements, you're going to love Ghost in the Machine. Highly recommend! 5+ stars
- N.N. Light Book Heaven reviews, Amazon Vine Voice reviewer
While Son of a Mermaid has strong romantic features, there's just as much adventure - think Game of Thrones underwater without the graphic sex... O'Sullivan does a masterful job creating a believable underwater culture. She also writes with complete authenticity about life in a seasonal coastal town.
- 5 star(fish) review from an Amazon reader
If you loved A Star is Born, you will LOVE this emotional rockstar redemption story (Quinn's Resolution)
- 5 star review from Angie, Amazon Vine Voice reviewer
O'Sullivan sets her books (yes, I eagerly pre-order each new release) in Cape Cod. I've never been there except through this talented author's words. This fun, fast-paced story really satisfied! Highly recommend!
- 5 stars from Claire Marti, USA Today best selling author