Callypso Lillis is a siren with a very big problem, one that stretches up her arm and far into her past. For the last seven years she's been collecting a bracelet of black beads up her wrist, magical IOUs for favors she's received. Only death or repayment will fulfill the obligations. Only then will the beads disappear. Everyone knows that if you need a favor, you go to the Bargainer to make it happen. He's a man who can get you anything you want...

When the evil Vordan exposes a secret her father has kept for years, Alosa and her crew find themselves in a deadly race against the fearsome Pirate King to claim a legendary hidden treasure.

Chava, a golem brought to life by a disgraced rabbi, and Ahmad, a jinni made of fire, form an unlikely friendship on the streets of New York until a fateful choice changes everything.

When Neptune tells Emily and her merman father and human mother to return to Brightport to try to make merpeople and humans work more closely together, Emily faces problems with old enemies, her new, half-merfolk friend Aaron, and a mystery related to a group of legendary lost sirens.

Returning to Boston for her senior year of high school after the sudden death of her older sister, seventeen-year-old Vanessa must ward off her transformation into a full-fledged siren while also trying to handle applying to college, a long-distance relationship, and the mysterious return of the sirens she thought she had killed.

As a disgraced member of a fallen house, Cassandra Gataki has seen firsthand what comes from trusting the venomous Thirteen. But when the maddeningly gorgeous and kind Apollo asks her to go undercover as his plus-one at aweek-long party hosted by a dangerous new power player...Cassandra reluctantly agrees to have his back. On one condition: when it's all over, and Apollo has the ammunition he needs to protect Olympus, she and her sister will be allowed...

Chava is a golem, able to hear the thoughts and longings of the people around her and compelled by her nature to help them. Ahmad is a jinni, a free-spirited creature of fire, imprisoned in the shape of a man. Pretending to be human, they are just two more immigrants in the bustling world of 1900s Manhattan. Park Avenue heiress Sophia Winston, whose brief encounter with Ahmad left her with a strange illness that makes her shiver with cold, travels...

Gemma must battle Penn to break the siren curse and secure a future with Alex.

Ridley will be the first to tell you that she's a bad girl. She's Dark. She's a Siren. You can never trust her. Link can never seem to remember that; quarter Incubus or not, his heart is Mortal when it comes to Ridley. When Link heads to New York to start a music career, Ridley goes along for the ride. As if leaving small-town Gatlin for the big city, trying to form a band, and surviving life with a partially reformed Siren isn't hard enough already,...