Into a haunted realm a creature unlike any is born. Orphaned and struggling to survive in an underground refuge, Riony only wants to keep her adopted sister safe. In a land where unicorns have been hunted to extinction and dragons are the exclusive possession of the dragonlords, Riony's life becomes complicated when she finds herself the caretaker of a unique and precious creature: a dragon-unicorn hybrid. But when her sister is kidnapped, Riony sets out on a dangerous journey into the shadowdragon cursed overworld, faced with an impossible challenge. Can she save her sister and also protect the newborn creature? Or will she have to sacrifice one for the other? Fans of Priory of the Orange Tree and The Dragon Prince will love this young adult fantasy set in a realm of heroines, magic, and dragons.