📖 About Underwater Investigation Unit

Underwater Investigation Unit is a series universe written by Andrew Mayne. The complete collection runs to 5 books across 1 series, published between 2020 and 2024.

The main series is Publication Order of Underwater Investigation Unit Books with 5 books. It opens with The Girl Beneath the Sea (2020) and currently runs to Dark Dive (2024).

Series included on this page:

🎯 Where to Start with Underwater Investigation Unit

New readers should begin with the first book of the main series in publication order: The Girl Beneath the Sea (2020), book 1 of Publication Order of Underwater Investigation Unit Books. Reading in publication order lets the world and characters develop the way the author intended, and it avoids spoilers that later books may contain.

Each of the 1 series on this page is expandable — click a series heading to see every title it contains, in order, with a direct link to buy the book on Amazon.

📚 Underwater Investigation Unit Books in Order

Publication Order of Underwater Investigation Unit Books
5 books
1
The Girl Beneath the Sea book cover1The Girl Beneath the Sea2020Buy on Amazon
Black Coral book cover2Black Coral2021Buy on Amazon
Sea Storm book cover3Sea Storm2022Buy on Amazon
Sea Castle book cover4Sea Castle2023Buy on Amazon
Dark Dive book cover5Dark Dive2024Buy on Amazon

❓ Frequently Asked Questions

How many Underwater Investigation Unit books are there?
There are 5 books in the Underwater Investigation Unit collection, organised into 1 series and published between 2020 and 2024.
What is the first Underwater Investigation Unit book?
The first book is The Girl Beneath the Sea, published in 2020.
What order should I read the Underwater Investigation Unit books in?
Most readers use publication order, which is the order the books were originally released. A chronological order is also provided on this page for readers who prefer to follow the internal timeline of the story.
Who wrote the Underwater Investigation Unit books?
The Underwater Investigation Unit books were written by Andrew Mayne.
Is the Underwater Investigation Unit series finished?
The main series, Publication Order of Underwater Investigation Unit Books, has 5 books so far. The most recent title listed on this page gives the current end point of the series.
When did the Underwater Investigation Unit series start?
The earliest title in this collection was published in 2020, and the most recent in 2024.