Books like Sea Witch by Katee Robert

A middle‑aged man returns to his childhood home, where memories of a magical girl and a mysterious farm haunt him, revealing a dark, supernatural mystery from his youth.

Kahlen, a siren bound by a life‑long oath of silence and isolation, finds her world upended when human Akinli steps into her hidden realm, forcing her to choose between duty and a forbidden love.

Siren princess Lira is turned human and must deliver Prince Elian’s heart to the Sea Queen before the winter solstice, while Elian hunts sirens and seeks the key to destroy them.

A children’s fantasy adventure that blends mermaids, magic, and the timeless battle between good and evil.

From the Water... For years, Margred has gone without the touch of another. Now, her need has driven her beyond her own world. For she is a selkie - a legendary being of the sea. able to shape into seductive human form. Finally, she has found the one she wants.... From the Land... A burned-out version of the of the big-city streets, Caleb Hunter was only too happy to take the job of police chief on the peaceful Maine island of World's End. Nothing ever happens in this tiny community surrounded by the sea - until he meets a woman who's everything he's ever dreamed of. And more... To Each Other... Their passion is undeniable. Irresistible. But when a murderer begins targeting women in World's End, Caleb must face the terrible possibility that the killings are somehow connected to the mysterious Margred - and that the power of their love may change the fate of humanity.

A pirate orphan and an imperial rebel form an unlikely bond on the high seas, sparking a daring escape that frees a mystical mermaid and unravels a web of colonial intrigue, magic, and same‑sex love.

After her best friend Anna drowns, Evie feels isolated in a small fishing town. When a girl who looks like Anna appears offshore, Evie wonders if Anna survived and if her hidden magic can help.