When 22-year-old Joy Hayes realizes that the voice inside her head isn't her own, the battle begins for control of the young woman's mind, body, and soul.

After surviving years of childhood trauma, and a battle against cancer, life has led Joy into a dead-end accounting job-a purgatory of cubicles and beige walls. But then she meets Buttercup, an inner voice that is not her own-a sarcastic and mocking force with dark thoughts and powers beyond Joy's wildest imagination.

Embracing her newfound sense of power, Joy begins to wonder, with this unseen companion by her side, is it possible to win the heart of her best friend, Ethan, a nerdy but handsome engineering student?

But as Joy searches for happiness, she fails to realize that she's slowly losing herself to this darker force as the malevolent entity seeks to right the bigger wrongs in Joy's life. Tapping into Joy's repressed thoughts, Buttercup sets out to deliver justice-even if it means taking possession of the young woman's body to punish those deemed to be a threat.

After a lifetime of victimization at the hands of others, will Joy become a victim of her own mind, giving into Buttercup's darkest desires? Or will the young woman have the strength to seize control over her inner demon and repair her divided mind?