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  • Underwater Investigation Unit
  • The Girl Beneath the Sea

The Girl Beneath the Sea

Underwater Investigation Unit #1 / 6
by Andrew Mayne
The Girl Beneath the Sea (Underwater Investigation Unit #1) by Andrew Mayne
★ 9.00 / 1
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An Amazon Charts bestseller.

For a Florida police diver, danger rises to the surface in an adventurous thriller by the Wall Street Journal bestselling author of The Naturalist.

Coming from scandalous Florida treasure hunters and drug smugglers, Sloan McPherson is forging her own path, for herself and for her daughter, out from under her family’s shadow. An auxiliary officer for Lauderdale Shores PD, she’s the go-to diver for evidence recovery. Then Sloan finds a fresh kill floating in a canal—a woman whose murky history collides with Sloan’s. Their troubling ties are making Sloan less a potential witness than a suspect. And her colleagues aren’t the only ones following every move she makes. So is the killer.

Stalked by an assassin, pitted against a ruthless cartel searching for a lost fortune, and under watch within her ranks, Sloan has only one ally: the legendary DEA agent who put Sloan’s uncle behind bars. He knows just how deep corruption runs—and the kind of danger Sloan is in. To stay alive, Sloan must stay one step ahead of her enemies—both known and unknown—and a growing conspiracy designed to pull her under.

Amazon: Check Best Offer

ThrillerMysteryCrime FictionSuspense Thriller
Release date: May 1, 2020

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Andrew Mayne

Andrew Mayne

Andrew Mayne is not just a bestselling author—he’s a magician whose illusions have dazzled audiences across the globe and a pioneer in artificial intelligence. With a background that seamlessly blends magic, technology, and storytelling, Mayne brings a unique energy and perspective to the world of thrillers and suspense.

Born with a fascination for the extraordinary, Andrew started his career as a magician, creating mind-bending illusions that left audiences questioning reality. His innovative style, dubbed “Shock Magic,” combines street-level trickery with grand illusions, earning him spots performing for prestigious names like David Copperfield and even astronauts aboard the International Space Station. But his creative vision didn’t stop there.

Read more ...

As an author, Andrew has crafted a niche in the world of suspense with novels that intrigue, thrill, and captivate. His books, like The Naturalist and Black Fall, are known for their tightly woven plots, intricate scientific concepts, and a deep dive into human psychology. His protagonists are often drawn into mysterious, high-stakes situations where the lines between logic and the unknown blur in ways that keep readers on the edge of their seats. It’s this blend of scientific curiosity and heart-pounding suspense that has earned him nominations for prestigious literary awards such as the Edgar and Thriller Awards.

Beyond the realm of magic and books, Andrew’s influence stretches into the world of artificial intelligence. As the Science Communicator and a key figure at OpenAI, he was instrumental in the development of GPT-3 and ChatGPT, helping shape the tools that are now central to AI-driven creativity.

With each book, magic trick, or technological breakthrough, Andrew Mayne continues to blur the boundaries between reality and imagination. His work invites readers and viewers alike to question what they know—and challenge the limits of what’s possible. Whether through the written word, a sleight of hand, or a deep dive into cutting-edge AI, Andrew’s creativity knows no bounds.

Underwater Investigation Unit

The Underwater Investigation Unit series immerses readers into a world where danger lurks beneath the surface of the ocean, and no mystery is too deep to uncover. With its perfect blend of pulse-pounding suspense, meticulous police work, and the eerie allure of underwater exploration, this series presents a unique twist on the traditional thriller. Here, crime doesn’t just happen on land—it thrives beneath the waves.

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The series follows Sloan McPherson, a seasoned detective with a past shaped by the deep blue, as she teams up with former Navy diver Scott Hughes. Together, they tackle some of the most perplexing cases involving underwater crimes, missing persons, and the shadowy world of marine ecology. From sunken wrecks to illegal treasure hunting, the stakes are always high, and the ocean itself is as much a character as the human ones.

In each installment, Mayne takes readers on a journey not only through intricate investigations but also into the heart of the ocean’s mysteries. The compelling plots dig into environmental issues like coral poaching and ecoterrorism, while also exploring the psychological toll of underwater exploration. The unpredictability of life beneath the water’s surface, where the normal rules no longer apply, adds an extra layer of tension to every chapter.

But it’s not just about the crimes. As the series progresses, the emotional stakes grow, deepening the relationships between Sloan, Scott, and the community around them. These aren’t just detectives solving crimes—they’re people with history, who are forced to face their own demons as they dive into the unknown.

Whether it’s a cruise ship bombing off the coast of Florida or a chilling disappearance that leads to a submerged treasure hunt, each story in the Underwater Investigation Unit series is filled with danger, intrigue, and complex, well-rounded characters. Mayne’s meticulous attention to detail, especially with diving techniques and marine biology, adds an authentic touch that elevates this series beyond the typical crime procedural.

For readers who crave something more than just a typical thriller, Underwater Investigation Unit delivers not only a deep dive into suspenseful mysteries but a fascinating look at the unforgiving beauty of the ocean itself. Prepare to hold your breath as you descend into the dark depths of crime and intrigue—where not everything is what it seems, and the ocean's secrets are always waiting to be discovered.


Underwater Investigation Unit consists of five books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

The Girl Beneath the Sea (Underwater Investigation Unit #1)
★ 9.00 / 1
Black Coral (Underwater Investigation Unit #2)
★ 9.00 / 1
Sea Storm (Underwater Investigation Unit #3)
★ 8.00 / 1
Sea Castle (Underwater Investigation Unit #4)
★ 8.00 / 1
Dark Dive (Underwater Investigation Unit #5)
⧗ 8.00 / 1
Underwater Investigation Unit Book 6 (Underwater Investigation Unit #6)
⧗ 9.20 / 5


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