Once there was a mermaid called Amelia who could never be content in the sea, a mermaid who longed to know all the world and all its wonders, and so she came to live on land. Once there was a man called P. T. Barnum, a man who longed to make his fortune by selling the wondrous and miraculous, and there is nothing more miraculous than a real mermaid. Amelia agrees to play the mermaid for Barnum and walk among men in their world, believing she can leave anytime she likes. But Barnum has never given up a money-making scheme in his life, and he's determined to hold on to his mermaid.

Sanna is a mermaid - but she is only half seavish. The night of her birth, a sea-witch cast a spell that made Sanna’s people, including her landish mother, forget how and where she was born. Now Sanna is sixteen and an outsider in the seavish matriarchy, and she is determined to find her mother and learn who she is. She apprentices herself to the witch to learn the magic of making and unmaking, and with a new pair of legs and a quest to complete for her teacher, she follows a clue that leads her ashore on the Thirty-Seven Dark Islands.

Everything about my life is a lie. As a hidden twin princess, born second, I have only one purpose―to sacrifice my life for my sister if death comes for her. I’ve been living under the guise of a poor, obscure girl of no standing, slipping into the palace and into the role of the true princess when danger is present. Now the queen is dead and the ageless King Eidolon has sent my sister a gift―an eerily familiar gift―and a proposal to wed. I don’t trust him, so I do what I was born to do and secretly take her place on the eve of the coronation.

Before Prince Eric's mother, the Queen of Vellona, went missing two years ago, she reminded him about the details of the deadly curse that has plagued his entire life. The curse? If he were to kiss someone other than his true love, he would die. With a neighboring kingdom looking for any excuse to invade their shores, and rumors of ghost pirates lurking the seas, Eric is desperate for any information that may help him break his enchantment and bring stability to Vellona.

Annaleigh lives a sheltered life at Highmoor with her sisters and their father and stepmother. Once there were 12, but loneliness fills the grand halls now that four of the girls' lives have been cut short. Disturbed by a series of ghostly visions, Annaleigh becomes increasingly suspicious that her sister's deaths were no accidents. The girls have been sneaking out every night to attend glittering balls, dancing until dawn in silk gowns and shimmering slippers, and Annaleigh isn't sure whether to try to stop them or to join their forbidden trysts.

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. For Flora, former starving urchin, the brutal life of a pirate is about survival: don't trust, don't stick out, and don't feel. But on this voyage, Flora is drawn to the Lady Evelyn Hasegawa, who is headed to an arranged marriage she dreads. Flora doesn't expect to be taken under Evelyn's wing, and Evelyn doesn't expect to find such a deep bond with the pirate Florian. Neither expects to fall in love.

Deadly storms have ravaged Mina’s homeland for generations. Floods sweep away entire villages, while bloody wars are waged over the few remaining resources. Her people believe the Sea God, once their protector, now curses them with death and despair. In an attempt to appease him, each year a beautiful maiden is thrown into the sea to serve as the Sea God’s bride, in the hopes that one day the “true bride” will be chosen and end the suffering.

Mira is a mermaid on a mission. It’s time to leave the ocean. Mira Belshaw has been at sea for...well, she doesn’t know how many years. It’s hard to keep track of time when you live in the ocean. But after enough time, the salt water triggers the desire to procreate, and her time is up. Finding a mate is the most important thing to her right now, and to do that, she has to return to the place where she was last human - the coastal city of Saltford.

In the house of Helios, god of the sun and mightiest of the Titans, a daughter is born. But Circe is a strange child—not powerful, like her father, nor viciously alluring like her mother. Turning to the world of mortals for companionship, she discovers that she does possess power—the power of witchcraft, which can transform rivals into monsters and menace the gods themselves.

Kathleen has always been dramatic. She suffers from the bizarre malady of experiencing stabbing pain in her feet. On her 16th birthday, she woke screaming from the sensation that her tongue had been cut out. No doctor can find a medical explanation for her pain, and even the most powerful drugs have proven useless. Only the touch of seawater can ease her pain, and just temporarily at that.

When Rose first met Charles, he was trapped in the form of a white bear. To rescue him, Rose traveled to the land that lay east of the sun and west of the moon to defeat the evil Troll Queen. Now, Rose has found her happily ever after with Charles - until a sudden storm destroys his ship and he is presumed dead. But Rose doesn’t believe the shipwreck was an act of nature, nor does she believe Charles is truly dead. Something much more sinister is at work.

The House of Berethnet has ruled Inys for a thousand years. Still unwed, Queen Sabran the Ninth must conceive a daughter to protect her realm from destruction - but assassins are getting closer to her door. Ead Duryan is an outsider at court. Though she has risen to the position of lady-in-waiting, she is loyal to a hidden society of mages. Ead keeps a watchful eye on Sabran, secretly protecting her with forbidden magic.

Scotland, 1026 - Gruoch, descendant of the line of MacAlpin, should have been born into a life of ease. But fate is fickle. Her father's untimely death, rumored to have been plotted by King Malcolm, leaves her future uncertain and stained by the prophecy that she will avenge her family line. Escaping to one of the last strongholds of the old Celtic gods, Gruoch becomes an adept in arcane craft. Her encounters with the otherworld, however, suggest that magic runs stronger in Scotland than she ever imagined.

Eighteen-year-old Xifeng is beautiful. The stars say she is destined for greatness, that she is meant to be empress of Feng Lu. But only if she embraces the darkness within her. Growing up as a peasant in a forgotten village, Xifeng longs to fulfill the destiny promised to her by her cruel aunt, the witch Guma, who has read the cards and seen glimmers of Xifeng's majestic future. But is the price of the throne too high? Because in order to achieve greatness, she must spurn the young man who loves her and exploit the callous magic that runs through her veins.

Haelewise has always lived under the shadow of her mother, Hedda—a woman who will do anything to keep her daughter protected. For with her strange black eyes and even stranger fainting spells, Haelewise is shunned by her village, and her only solace lies in the stories her mother tells of child-stealing witches, of princes in wolf-skins, of an ancient tower cloaked in mist, where women will find shelter if they are brave enough to seek it. Then, Hedda dies, and Haelewise is left unmoored.