A sweeping romantasy debut about sisterhood, rebellion, and the danger of forbidden love – featuring ancient immortal clans, hidden spells, morally grey love interests, and a war that threatens to fracture the realms – for fans of Sarah J. Maas, Penn Cole and Victoria Aveyard.

Exiled to the mortal realm of Asterra for a crime their mother committed, Siren sisters Adriana and Estelle have spent their lives as outcasts in an underwater clan of exiled Sirens, forbidden to return to the immortal realm of Eryndor.

While Adriana is determined to win back the favour of the immortals who banished them, Estelle is increasingly drawn to the Asterran rebellion – which seeks to destroy the gate that keeps the mortal and immortal realms separated.

When the rebellion makes their move on the gate, the sisters are forced to take sides. But as monsters from the underworld slip through the breach, Adriana must choose between upholding the laws that cast them out… or standing with her sister. Because Estelle isn’t just chasing danger – she’s falling for it. Her connection to a rebel leader threatens to unravel everything she thought she knew about loyalty, love, and the price of freedom.

As war breaks out, the sisters will be forced to use their Siren songs for opposing sides – but who will surface triumphant, and who will sink down to greater depths?