Blood Oath weaves the tale of Kirin, a unicorn lured by a lustful mage into a Blood Oath that traps her in a human body. Try as she might to rebel, the Blood Oath that she swore to the human is too powerful and she is helpless as Cinthe, the mage, takes control of her body and her life.

When a woman comes along decades later with the potential to free Kirin from her Blood Oath, she must tread carefully as she trains her in the art of magic without letting Cinthe suspect that rebellion has once again stirred in her heart. Will Kirin be able to free herself and return to her unicorn form? Or will Cinthe destroy her horn and any hope of revival when she realizes the threat that the woman poses?