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, 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 rebellion – which seeks to overthrow the immortal ruling class. 

As monsters from the underworld slip through a breach in the gate between realms, the rebellion makes their move, forcing the sisters to take sides. Adriana must choose between upholding the laws or standing with her sister. But 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 – but who will surface triumphant, and who will sink down to greater depths?