Uncovering an ancient evil, Serafina, a mermaid of the Mediterranean Sea, searches for five other mermaid heroines who are scattered across the six seas, to save their hidden world.

"A mermaid and her otter friend go on a journey to help a lost beluga whale return to the Arctic."--

In a society determined to keep her under lock and key, Tavia must hide her siren powers. Meanwhile, Effie is fighting her own family struggles, pitted against literal demons from her past. Together, these best friends must navigate through the perils of high school's junior year. But, everything changes in the aftermath of a siren murder trial that rocks the nation, and Tavia accidentally lets out her magical voice at the worst possible moment. Soon,...

Aboard the pirate ship Dove, Flora the girl takes on the identity of Florian the man to earn the respect and protection of the crew. The brutal life of a pirate is about survival: don't trust, don't stick out, don't feel. When the pirates prepare to sell their unsuspecting passengers into slavery, Flora is drawn to the Lady Evelyn Hasegawa, who is en route to a dreaded arranged marriage with her own casket in tow. The pair set into motion a wild escape...

Oona and her best friend Otto love to search for treasure...and often find trouble instead. Messy trouble. Tricky trouble. Even shark-related trouble. That's never stopped them before, though! After all, no proper treasure hunt is without some adventure. But when the grandest treasure yet is stuck in a deep, dark rift, Oona's not sure if she can dive right in. What might be waiting for her in those unknown waters?

"No human has ever made the Crossing of Ingo - the most dangerous journey young Mer have to face. Sappphy and Conor have been chosen for this epic challenge, and the future of both Air and Ingo depends on their success. But Ervys, his followers and new recruits, the sharks, are deteremined to stop them - dead or alive ..." Back cover.

Emily is headed to a tropical island for a relaxing vacation with friends and family. And this time, Emily promises her best friend, Shona, there will be absolutely no adventure just plenty of fun. But somehow excitement always seems to find Emily, and before she knows it, she ends up on the other side of a powerful waterfall on a forgotten island no one else can get to.

When the ferocious shape-shifting Kraken awakes after thousands of years and threatens the Mer, Sapphire agrees to help them by going with her brother Conor and their friend Faro into the Deep to lull the monster back to sleep.

"Fish Girl, a young mermaid living in a boardwalk aquarium, has never interacted with anyone beyond the walls of her tank until a chance encounter with an ordinary girl, Livia. Their growing friendship inspires Fish Girl's longing for freedom, independence, and a life beyond the aquarium tank"--