There are 2 books in the Of Mermaids and Orisa series. The newest book is Soul of the Deep which came out in 2022.

1
Skin of the Sea

Book cover of Skin of the Sea
INSTANT NEW YORK TIMES BESTSELLER * The must-read Black mermaid fantasy series that #1 NYT bestselling author Nicola Yoon calls "epic and original," in which one mermaid takes on the gods themselves. Perfect for fans of Children of Blood and Bone and Beasts of Prey.

"Riveting." -NPR
"Evocative." -Entertainment Weekly…
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2
Soul of the Deep

Book cover of Soul of the Deep
The stunning sequel to New York Times bestseller Skin of the Sea, in which the world must pay the price for one mermaid's choice, and a dark force reverberates across realms. Perfect for anyone eagerly anticipating the live-action The Little Mermaid.

One life.
One choice.
One sacrifice.

To save those…