“Don't take magic sugar from strangers. Trust me.” --Devany Miller 

Devany Miller doesn't believe in magic, at least not until she's in the middle of a witch battle that ends with Devany in the clutches of a group of criminals who want to use her dead body to fuel their spells. A dying woman gives Devany a magical object of great power hoping it will aid her escape. Before she can, an assassin spider creeps in to collect the magical heart and kill the witch who made it. 

The spider lunges, Devany swings, the witch unleashes a spell and-- 

--Devany awakens to a demon claiming she has stolen his heart and his spider. He has the devil's own eyes, the smile of Don Juan ... and Devany doesn't trust him one bit. If that wasn't enough, she arrives home to learn that her husband is having an affair. When the witch speaks up in her head to tell her the spider and heart are also inside her she realizes her life has turned upside down and sideways. 

While she struggles to control the heart's power, the criminals hunt her to carve the heart from her body, the demon insists she behead a fleshcrawler, his boss desires Devany's soul, and her husband begs her to forgive him so they can work things out. 

It's fine. She only has a full time job, kids, and a house to care for. No big. 

It isn't until the criminals take her kids that Devany understands the depths to which her anger and fear can take her. Everyone underestimates how dangerous she is now that they've pushed her past her limits. Devany stops at nothing to find her kids and punish those who would dare harm them.