The Endless Ocean by Toby Bennett

All oceans are one ocean, water without end and at the heart of it all a secret slumbers, gnawing and waiting, for no secret remains hidden forever. Can two orphans who have never heard of realms beyond their own prevent the destruction that threatens every shore? Only time will tell.

When Oceans Rise by Robin Alvarez

Submerged in a toxic relationship and disconnected from everyone, she turns to the sea to decide her fate. Its decision? Toss her to the sea witch. Seventeen-year-old Malaya is cursed. In her family, every girl’s first love ends in death after falling for someone evil. Good thing Malaya’s dream guy isn’t monstrous. Except the curse is real and preventing Malaya from noticing how much he has gaslit and isolated her until she can’t be saved. With no other options, the sea witch is the only one to help her. Bartering her voice for a new life where she and her abusive boyfriend never met, Malaya accidentally swaps places with an alternate timeline version of herself who didn’t make her mistakes. As she tries to undo the switch, the sea witch uses Malaya’s voice to unleash Filipino mythological creatures into the worlds. Can a champion, an alternate timeline sister, and Malaya fight these beasts and stop the sea witch before she destroys both timelines?

A Case of Madness by Yvonne Knop

Andrew Thomas just got sacked. He's permanently drunk. He's got cancer. Is inescapably gay. Was hit by a bus. And he's fallen in love with a stranger whose life he saved. As a newly-unemployed Sherlock Holmes scholar, Andrew knows only Holmes can help him untangle the madness his life has become, but Holmes isn't real. Except he absolutely appeared in Andrew's house, told him he's in love with a man he just met…and then in a fit of pique Andrew sent him away. Sure Holmes is probably a hallucination or a specter or a ghost, but now Andrew desperately needs his help. So to find the answer to his case and the man of his dreams, Andrew takes to chasing a fictional character through London with his very own Watson.