5 books in series

Underwater Investigation Unit

Underwater Investigation Unit is a 4-book series with 4 primary works first released in 2020 with contributions by Andrew Mayne.

The Girl Beneath the Sea
#1PopularFirst

2020 • 42 Readers • 328 pages • 3.9

Black Coral
#2

2021 • 14 Readers • 320 pages • 4

Sea Storm
#3

11 Readers • 3.9

Sea Castle
#4

2023 • 7 Readers • 316 pages • 4

Dark Dive
#5

2024 • 5 Readers • 3