Books like Sea Witch comes home by Malcolm Saville

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.

Sea of Tranquility is a contemporary fiction novel by Emily St. John Mandel that blends time travel, epidemics, and space colonies into a thought‑provoking narrative.

In the tumultuous Fifth‑century Britain of Mary Stewart’s The Crystal Cave, the story chronicles the rise of Merlin—born Myridden Emrys, the illegitimate son of a Welsh princess—against the backdrop of war, prophecy, and the birth of King Arthur.

During a summer holiday in Cornwall, a group of friends and a parrot discover that the Isle of Gloom hides sinister secrets beneath its surface—abandoned copper mines and hidden sea tunnels that spark a perilous adventure.

Through courage and perseverance a peasant girl frees her husband, an enchanted prince, from the spell of the evil sea witch.

A 17‑year‑old named Miranda travels to Selkie Island, Georgia, after her grandmother’s death. There she confronts family secrets, her own skepticism, and unexpected paranormal mysteries tied to the island’s mermen.

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.

Mildred Hubble, the notorious student at Miss Cackle's Academy, must face new challenges when her beloved cat Tabby accompanies them on a seaside school trip.