Princess Callista volunteers to trade places with her manipulative half-sister Elle, agreeing to wed Isvel, the supposedly bloodthirsty Black Dragon of the Abyss, in exchange for funds to purchase the rare Dawnlight Petal for her dying mother. Her selfless sacrifice turns into heartbreak when Elle and Callista's arrogant former fiancé Prince Gareth steal the enchanted petal for vanity, causing Callista's mother to perish unattended.
Gareth assumes Callista will perish in the monster's volcanic lair, only to discover Isvel is an honorable, deeply devoted sovereign who shields Callista with tender reverence. As Callista flourishes as the beloved Queen of the Abyss, Gareth realizes he threw away true devotion for a hollow fraud and arrives begging at the borders. Callista never glances backward, ordering the dragon artillery to fire.
