Reunited with her merman father and now living on an island located in the Bermuda Triangle, twelve-year-old Emily accidentally awakens the fearsome kraken and also faces a bully from her past.

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.

"Twelve-year-old Kela is still mourning her mother when she finds a mermaid's comb while she and her friend are looking for sea glass on her Caribbean island; such combs have magic in them, and touching it opens a connection to the mermaid Ophidia who can grant her wish, to bring her mother back to life--but all wishes have consequences, and magic demands a price which may prove to be more painful than the loss of her mother."--

As they search for their missing father near their Cornwall home, Sapphy and her brother Conor learn about their family's connection to the domains of air and of water.

Vacationing in a sleepy beach town for the summer, Sam is pursued by hordes of blonde girls before falling in love with the unusual DeeDee, who compels him to uncover secrets about the community's ocean-dwelling inhabitants.

Assaulted and left on the cliffs outside of her grim Alaskan fishing village by her abusive, alcoholic uncle, fourteen-year-old Luce expects to die when she tumbles into the icy waters below, but when she instead transforms into a mermaid she is faced with struggles and choices she could never have imagined.

Since cutting off her wings to save Never Land, Rani, a water-talent fairy, feels out of place with the fairies and wonders if she should live with the mermaids instead.

As a mermaid versus human war looms on the horizon, Luce falls in love with her sworn enemy, Dorian, and assumes her rightful role as queen of the mermaids.

A class trip to a beautiful island is overshadowed by a local myth about a mysterious ship that may have ties to the lost city of Atlantis.

Sapphy and her brother Conor have been called to take part in an ancient and dangerous coming-of-age ritual, but Ervys and his followers are determined to stop them.