A creature that feeds on fear is hired to exact revenge, with the ultimate price being the life of the person who hired him. A Nightmare, a being of immense cruelty, operates under a strict contract: the client who hires him pays with their own life. His services are reserved for those brought to him by fate, such as Mina, a woman consumed by a desire for vengeance so potent she is willing to sacrifice her own existence to achieve it. The Nightmare typically remains detached from human motivations, viewing clients as mere sustenance and jobs as transactional. However, Mina's enemies will face their reckoning, and he will claim his due: her beating heart.

The premise sets up a dark fantasy romance with a morally ambiguous protagonist. The narrative framework, told from the perspective of the Nightmare, suggests an exploration of monstrous desires and the complexities of human motivation when driven by revenge. The high stakes of the contract, where the client's life is the payment, create immediate tension and a sense of inevitable tragedy or dark fulfillment. The focus on the protagonist's nature as a fear-eater and his eventual claim on Mina's heart points towards a story that delves into the darker aspects of desire and consequence within a supernatural context.