Rogue Wave is the second book of the Waterfire Saga after Deep Blue where the mermaids are separated. Serafina, Neela, Ling, Ava, Becca and Astrid, six mermaids from realms scattered throughout the seas and the freshwaters, were summoned by the leader of the river witches to learn an incredible truth; the mermaids are direct descendants of the Six Who Ruled - powerful mages who once governed the lost empire of Atlantis. The ancient evil that destroyed Atlantis is stirring again, and only the mermaids can defeat it. To do so, they need to find magical talismans that belonged to the Six.
The story begins when Serafina is swimming into the mirror realm. She is encountered by Rorrim Drol, in the Hall of Sighs in Vadus. She narrowly escapes him by naming all her fears and therefore giving him a stomach ache so he can't follow her. She then rides a silverfish to a mirror in the Lost City of Atlantis. There, she finds a temple for Morsa, an evil goddess and meets Ling, the descendant of Sycorax.
She and Ling explore the ruins and Sera,finding a blood pool by one of the altars, draws a bloodsong. It is filled with screaming and pleading and Sera lets go in horror. Ling suggests they find a mirror, because it is likely a vitrina can tell them where to go. They meet Lady Thalia who tells them about three of the talismans: Merrow's blue diamond, Navi's moonstone and Orfeo's black pearl. Before she can tell them about the rest, they are attacked and have to smash the mirror. Sera and Ling go their separate ways in the hunt.
Serafina believes her talisman was buried with an old shipwreck. While researching it's location, she is almost discovered by a death rider patrol led by someone familiar, Mahdi. The pain seeing him turned to a traitor is devastating.
Neela travels to Matali to warn her parents of the grave threat facing their world. But they find her story outlandish; a sign that she need to be confined to her chamber for rest and recovery. She then escapes and travels to Kandina, where her talisman is in the possession of fearsome razormouth dragons.
As they hunt for their talismans, both Serafina and Neela find reserves of courage and cunning they didn't know they possessed. They face down danger and death, only you endure a game-changing betrayal, as shocking as rogue wave.
- The book cover is Neela in the razor mouth dragons cave to find her talisman
- Rogue Wave came out on January 6, 2015