The Wicked Prince

Kyra's sister is dead - and it's the human prince's fault.
Mermaid Kyra is devastated when her sister dies as a result of the human Prince Rhydian's betrayal. Driven by her grief, Kyra strikes a dangerous bargain with the sea witch to kill him: she will become human and infiltrate the Whitecliff Estate as a handmaiden to Rhydian's new fiancée.
Moving into the estate, Kyra is forced to confront Lord Nicholas Turner, the gorgeous young man she once rescued from a shipwreck. With her identity hanging in the balance, she tries to resist her growing feelings for him to keep her plan - and her true nature - from being compromised.
But as humans begin to die mysteriously around the estate, Kyra and Nicholas uncover darker schemes with lacings of dark magic that could threaten both land and sea. And Kyra must decide whether her thirst for revenge is more important than following her heart.
This novel is part of the Nethervale series of standalone fairytale retellings. The Wicked Prince is a retelling of Hans Christian Andersen's The Little Mermaid with a revenge arc, a sweet closed-door romance, and a splash of darkness and adventure.