With Penn and Lexi determined to kill Gemma and replace her with another siren, Gemma, aided by Harper and Daniel, must delve into her enemies' mythical past and darkest secrets in a last-ditch effort to protect all that she holds dear.

"When Ridley goes missing after a car crash, Link, his bandmates, and Lennox Gates, joined by Liv and John Breed, embark on a search for the Siren, taking them to Mississippi, where they encounter legendary blues guitarist Robert Johnson, and then to New Orleans, where an evil threatens to destroy them all."--

Years ago, Kahlen was rescued from drowning by the Ocean. To repay her debt, she has served as a Siren ever since, using her voice to lure countless strangers to their deaths. Though a single word from Kahlen can kill, she can't resist spending her days on land, watching ordinary people and longing for the day when she will be able to speak and laugh and live freely among them again. Kahlen is resigned to finishing her sentence in solitude... until...

Seventeen-year-old violinist Moira Alexander joins with an old friend, Jude Osric, in seeking a killer after the sirens who live near their island are falsely accused of murder.