Once in a land of swan princesses and star-touched changelings two sisters were on opposite sides of a war. The cost will be high but balance must be struck in this heart-pounding and enchanting conclusion to this internationally bestselling romantasy trilogy.  After the explosive finale of the Tournament of Kings, Fia and Irian manage to escape to the wildlands, dodging pursuit by her cunning sister Eala. With Fia locked in her own mind, battling a powerful celestial entity, Irian must form new alliances to come up with a plan to defeat Eala’s terrifying magic. With both the human and fae realm under threat, Eala's rampage must be stopped, no matter the cost. On Bealtain Eve, when the veil between worlds is at its thinnest, Fia and Irian will finally face off against the swan princess and forge the ending to their love story that was written in the stars.