Esta serie se adentra en reinos de fantasía oscuros y relaciones peligrosas. Sigue el destino de una joven atrapada entre dos mundos: su vida terrenal y un seductor pero mortal inframundo llamado Everneath. Tras haber perdido tiempo en este reino, regresa con un tiempo limitado para despedirse y buscar la redención antes de ser reclamada eternamente. Su presencia, sin embargo, atrae a un poderoso inmortal que la desea como su reina, obligándola a una desgarradora elección entre el amor verdadero y un destino ineludible.
Six months ago, Nikki Beckett vanished into an underworld known as the Everneath. Now she's returned to her old life for another six months before the Everneath comes to claim her ... this time for ever -- cover.
Now that Nikki Beckett's boyfriend has been sucked into the tunnels of the Everneath, Nikki must journey down to the underworld to bring him back before he is lost forever
Having finally rescued Jack from the dark Tunnels of the Underworld, all Nikki wants is to be with him and for life to return to normal. But Cole tricked Nikki as they journeyed through the labyrinth of the Everneath, and now she's started turning into an Everliving just like him. Desperate to find a way to reverse the process, Nikki and Jack try everything they can think of. Even Cole becomes an unlikely ally, but for how long? Nikki needs to feed on Cole to survive, Cole needs Nikki to gain control of the throne in the Everneath, and Jack needs Nikki because she is everything to him. Together, they must travel back to the Underworld to undo Nikki's fate and make her mortal once more. Will Nikki be forced to spend eternity in the Underworld - or does she have what it takes to bring down the Everneath once and for all?